Carbon nanotubes zoe sawyer
•
1 like•276 views
Carbon nanotubes are sheets of graphite that are rolled up and capped at both ends. There are two types: multi-walled, which are tubes within tubes, and single-walled, which are single tubes about 1nm in diameter. Carbon nanotubes can be conductors or semiconductors depending on their diameter, and they were the material used to build the first carbon nanotube transistor in 1998. Carbon nanotubes are also very strong and have been incorporated into composite materials to increase strength and durability.
Report
Share
Report
Share
Download to read offline
Recommended
Organic- Inorganic Perovskite Solar Cell
The document discusses perovskite solar cells. It begins by defining perovskites and their crystal structure. It then discusses several important studies on perovskite solar cells that improved their efficiency over time, including studies published in 2012, 2013, 2014 and 2015 that achieved efficiencies up to 19.3%. It also reviews factors that affect the performance and stability of perovskite solar cells, such as humidity, UV light, annealing temperature, and the choice of electron transport material. In conclusion, it summarizes that perovskite solar cells have advantages over traditional silicon solar cells like easier processing, higher efficiency potential, flexibility and lower cost.
Presentation on Perovskite Solar Cell.
The document discusses improving light trapping in perovskite solar cells by developing a nano-structured transparent contact. The goal is to enhance the quantum efficiency, short-circuit current, and open-circuit voltage of perovskite solar cells to increase overall efficiency. A methodology is proposed that involves simulating flat and nano-cone structured perovskite solar cells and modifying the nano-cone structure parameters to optimize light trapping. Simulation results show reduced power losses and reflections with the nano-cone structures compared to flat structures, demonstrating enhanced light trapping. Future work could involve developing lead-free perovskites and texturing multiple layers.
Perovskite solar cells
Perovskite Solar Cells
a short general overview presentation
hadi maghsoudi
device structure
crystal structure
preparation synthesis method
review papers
CuI/Lead Halide Perovskite Solar Cells
This study investigates copper iodide (CuI) as an inorganic hole conductor for organolead halide perovskite solar cells. The researchers fabricated solar cells using CuI deposited via an automated drop casting technique. Compared to the conventional organic hole conductor spiro-OMeTAD, the CuI-based devices showed higher photocurrent stability and fill factor but lower open-circuit voltage. Impedance spectroscopy indicated the lower voltage was due to higher recombination rates in the CuI devices. However, CuI exhibited nearly two orders of magnitude higher hole conductivity than spiro-OMeTAD, suggesting its potential as a lower-cost replacement for organic hole transport materials.
Diamond Chip ppt
In a single defination, Diamond Chip or carbon chip is an electronic chip manufactured on diamond structure carbon wafer
Progress defense-group-61
This document summarizes a student group's progress defense presentation on their research developing nano-structured transparent contacts for dye sensitized solar cells. The group reports on their goals of analyzing photon absorption characteristics and enhancing efficiency. Their experimental design involves modeling amorphous silicon layers in a solar cell. Simulation results so far are presented. The group's timeline shows further analysis planned through the end of the year, culminating in a final defense. References cited research on TiO2 anodes, organic sensitizers, and carbon nanotube photoanodes to enhance dye sensitized solar cell efficiency.
Diamond Chip Technology
The document discusses the potential for "diamond chips" or carbon chips as an alternative to silicon chips. It notes that carbon chips could be smaller, faster, and withstand higher temperatures than silicon. The key components would be carbon nanotubes, which are rolled up sheets of graphene. Carbon nanotubes are semiconductors and could be arranged to create logic gates like AND, OR, and NOT. Diamond chips could enable smaller, more powerful devices that can operate in harsh environments like near engines.
CNT BASED CELL BY MOHD SAFIL BEG
This document summarizes a seminar presentation on carbon nanotube based solar cells. It begins with an introduction to carbon nanotubes, describing their cylindrical nanostructure formed from graphene sheets rolled at specific angles. It then discusses properties of carbon nanotubes that make them suitable for solar cells, such as their electrical conductivity. The document reviews different generations of solar cell technology and their limitations before describing how carbon nanotubes can be incorporated into dye-sensitized solar cells as transparent electrodes, replacing conventional materials like ITO. It presents results showing a carbon nanotube-based solar cell achieved 7.04% efficiency compared to 7.34% for a standard platinum electrode cell. In conclusion, carbon nanotube electrodes
Recommended
Organic- Inorganic Perovskite Solar Cell
The document discusses perovskite solar cells. It begins by defining perovskites and their crystal structure. It then discusses several important studies on perovskite solar cells that improved their efficiency over time, including studies published in 2012, 2013, 2014 and 2015 that achieved efficiencies up to 19.3%. It also reviews factors that affect the performance and stability of perovskite solar cells, such as humidity, UV light, annealing temperature, and the choice of electron transport material. In conclusion, it summarizes that perovskite solar cells have advantages over traditional silicon solar cells like easier processing, higher efficiency potential, flexibility and lower cost.
Presentation on Perovskite Solar Cell.
The document discusses improving light trapping in perovskite solar cells by developing a nano-structured transparent contact. The goal is to enhance the quantum efficiency, short-circuit current, and open-circuit voltage of perovskite solar cells to increase overall efficiency. A methodology is proposed that involves simulating flat and nano-cone structured perovskite solar cells and modifying the nano-cone structure parameters to optimize light trapping. Simulation results show reduced power losses and reflections with the nano-cone structures compared to flat structures, demonstrating enhanced light trapping. Future work could involve developing lead-free perovskites and texturing multiple layers.
Perovskite solar cells
Perovskite Solar Cells
a short general overview presentation
hadi maghsoudi
device structure
crystal structure
preparation synthesis method
review papers
CuI/Lead Halide Perovskite Solar Cells
This study investigates copper iodide (CuI) as an inorganic hole conductor for organolead halide perovskite solar cells. The researchers fabricated solar cells using CuI deposited via an automated drop casting technique. Compared to the conventional organic hole conductor spiro-OMeTAD, the CuI-based devices showed higher photocurrent stability and fill factor but lower open-circuit voltage. Impedance spectroscopy indicated the lower voltage was due to higher recombination rates in the CuI devices. However, CuI exhibited nearly two orders of magnitude higher hole conductivity than spiro-OMeTAD, suggesting its potential as a lower-cost replacement for organic hole transport materials.
Diamond Chip ppt
In a single defination, Diamond Chip or carbon chip is an electronic chip manufactured on diamond structure carbon wafer
Progress defense-group-61
This document summarizes a student group's progress defense presentation on their research developing nano-structured transparent contacts for dye sensitized solar cells. The group reports on their goals of analyzing photon absorption characteristics and enhancing efficiency. Their experimental design involves modeling amorphous silicon layers in a solar cell. Simulation results so far are presented. The group's timeline shows further analysis planned through the end of the year, culminating in a final defense. References cited research on TiO2 anodes, organic sensitizers, and carbon nanotube photoanodes to enhance dye sensitized solar cell efficiency.
Diamond Chip Technology
The document discusses the potential for "diamond chips" or carbon chips as an alternative to silicon chips. It notes that carbon chips could be smaller, faster, and withstand higher temperatures than silicon. The key components would be carbon nanotubes, which are rolled up sheets of graphene. Carbon nanotubes are semiconductors and could be arranged to create logic gates like AND, OR, and NOT. Diamond chips could enable smaller, more powerful devices that can operate in harsh environments like near engines.
CNT BASED CELL BY MOHD SAFIL BEG
This document summarizes a seminar presentation on carbon nanotube based solar cells. It begins with an introduction to carbon nanotubes, describing their cylindrical nanostructure formed from graphene sheets rolled at specific angles. It then discusses properties of carbon nanotubes that make them suitable for solar cells, such as their electrical conductivity. The document reviews different generations of solar cell technology and their limitations before describing how carbon nanotubes can be incorporated into dye-sensitized solar cells as transparent electrodes, replacing conventional materials like ITO. It presents results showing a carbon nanotube-based solar cell achieved 7.04% efficiency compared to 7.34% for a standard platinum electrode cell. In conclusion, carbon nanotube electrodes
Diamond chip
Carbon exists in many allotropes that can be used for electronics, such as diamond, graphene, carbon nanotubes, and lonsdaleite. Diamond chips are electronic chips manufactured using a diamond wafer that is doped to make it conductive. Carbon nanotubes have many desirable properties including strength, hardness, electrical and thermal conductivity, and can operate at higher temperatures than silicon chips. Potential applications of diamond chips and carbon nanotubes include information and communications technology, materials, biomedical devices, energy, transportation, and consumer goods. However, diamond chips are currently more expensive to produce than silicon chips due to the difficulty of doping the diamond structure.
diamond-chip report
1) Diamond chips or carbon chips are electronic chips manufactured using carbon or diamond as the substrate material instead of silicon. Carbon nanotubes are a major component used in carbon chips.
2) Carbon has advantages over silicon such as higher thermal conductivity, ability to withstand higher voltages and temperatures. However, carbon chips are still more expensive than silicon chips and electricity does not flow as smoothly through diamond as silicon.
3) Research is ongoing to address these issues and fully utilize the properties of carbon nanotubes and diamond film for applications like power electronics where their properties would provide benefits over silicon. Carbon chips are not expected to completely replace silicon for at least 20 more years.
Perovskite Solar cells
Perovskite solar cells (PSCs) utilize a perovskite structured compound as the light-harvesting active layer. PSCs consist of a transparent electrode, electron transporting layer, perovskite layer, hole transporting layer, and metallic electrode. When light enters the perovskite layer, electrons and holes are generated and transported through the layers, producing a current. PSCs can be produced through solution deposition methods and have advantages like higher efficiency and lower cost compared to silicon solar cells, but have disadvantages like using costly gold electrodes and short lifespan.
Carbon nanofiber poster
This document summarizes a study that characterized the structure and explored the mechanical properties of carbon nanofibers produced through electrospinning polyacrylonitrile (PAN) polymer precursor. The study used electrospinning to produce PAN nanofibers, which were then oxidized and carbonized. Scanning electron microscopy was used to examine the fiber diameters and structures. The conclusions discussed how processing parameters like voltage, needle diameter, and distance between needle and drum impacted fiber formation and properties. Carbon nanofibers produced through this method showed potential for applications in areas like heat transfer and composite reinforcement.
Carbon Nanotubes
New technology Model for 1 nm Transistors better than FIN-FET Technology.This slide Tells you in general about the nanotubes, how they are formed and why they are better than MOSFETs
Diamond chip
The document discusses a colloquium presentation on diamond chips. Diamond chips are manufactured from diamond structured carbon wafers and use carbon nanotubes as their major component. To make diamond conductive for electronics applications, it must be doped with elements like boron or nitrogen. Carbon nanotubes have excellent electrical and thermal properties and high strength. They allow for smaller, faster components that can operate at high temperatures. While diamond chips provide advantages over silicon, their production is more expensive and doping is more difficult due to diamond's structure. Overall, the presentation suggests that carbon chips may replace silicon in electronics in the future.
KDMiller_MRSEC_Poster_Final
This study aimed to replace lead in perovskite materials with barium to make optoelectronic devices more environmentally sustainable. The researchers synthesized barium iodide and attempted to intercalate methylammonium iodide to form methylammonium barium triiodide perovskite as described in a manuscript by Kumar et al. Characterization of spin-coated films found no evidence of perovskite formation and the solutions degraded when exposed to air, inconsistent with Kumar's results. Further work is needed to explore alternative precursors, synthesis methods, and characterization of any photonic properties.
Diamond Chip
This document discusses the potential for diamond chips to replace silicon chips in electronics. Diamond chips are made from carbon and have several advantages over silicon, including smaller size, faster operating speeds, higher thermal conductivity, and the ability to handle more power. Carbon nanotubes are a key material that enable diamond chip technology by exhibiting metallic or semiconducting properties depending on their structure. While diamond chips are currently more expensive than silicon, their superior properties may allow for smaller, faster, and more powerful electronic devices in the future.
Carbon nanofiber abstract
This document discusses electrospun carbon nanofibers. It begins by noting the interest in carbon nanofibers due to their potential applications and describes typical production methods. It then explains that carbon nanofibers can be produced through pyrolyzing electrospun polymer nanofibers. The document goes on to describe the specific electrospinning process used, utilizing polyacrylonitrile dissolved in dimethylformamide and optimizing the oxidation and carbonization processes to produce carbon nanofibers in the hundreds of nanometers in diameter. The carbon nanofibers were then analyzed using scanning electron microscopy and infrared spectroscopy.
Metal Nanoparticles - Solids
This document discusses how the properties of metallic nanoparticles differ from macroscale particles due to their small size at the nanoscale. It explains that as particle size decreases, the ratio of surface atoms to interior atoms increases. This means the percentage of surface atoms and the average coordination number in the sample decreases. It also impacts properties like melting point, color and reactivity due to the higher proportion of surface atoms.
Fabrication of perovskite solar cell
Project on Methyl Ammonium Lead Iodide solar cell with Copper iodide as hole transport layer and zinc oxide as electron transport layer.
Seminar Report on Carbon Nanotube Field Effect Transistor
This document provides an overview of carbon nanotube field effect transistors (CNTFETs). It discusses the history of carbon nanotubes and how they were first discovered in the late 1880s. It then covers the different types of carbon nanotubes, their properties, and fabrication processes. A key part summarizes the characteristics of CNTFETs compared to traditional MOSFETs, noting advantages like higher speed, scalability and lower power consumption. The document concludes by comparing CNTFETs to MOSFETs and outlining potential future works.
Perovskites-based Solar Cells: The challenge of material choice for p-i-n per...
Perovskite-based PV have triggered widespread interest in the scientific community because these materials offer the attractive combinations of low cost and theoretically high efficiency. However, several challenges must be overcome for these relatively new PV materials. Among the many important challenges, one is the choice of materials to be used in thin film PV devices..
Based on fundamental principles of solar photovoltaics, this problem focuses on two aspects of the perovskite system:
1) Based on a planar p-i-n device structure, a potential list of p- and n-type charge collecting layers as well as the conductive contacts that could be used with a promising perovskite absorber material was identified, and a proper justification for the selection of each material in the device was given.
2) Three theoretical p-i-n type solar cells were made with the chosen materials and appropriate conductive contacts.
UMKC - Perovskite Solar Cells
The document discusses perovskite solar cells (PSCs) and highlights a new hole transport layer (HTL) material invented at the University of Missouri-Kansas City that could improve PSCs. Current PSCs use expensive and unstable HTL materials like spiro-OMeTAD. The new UMKC HTL material is inexpensive, transports charge fast, forms uniform dense films, provides good moisture barrier, and allows PSCs with significantly higher efficiencies and improved stability compared to spiro-OMeTAD. A provisional patent has been filed and further development is needed to fabricate PSCs in a clean room and demonstrate record efficiencies and stability under various conditions.
Perovskite
Perovskite: introduction, classification, structure of perovskite, method to synthesis, characterization by XRD and UV- vis spectroscopy , lambert beer's law, material properties and advantage and application.
carbon nanotubes
Carbon nanotubes are cylindrical carbon molecules that exhibit extraordinary strength, unique electrical properties, and efficient heat conduction. They can be produced via arc discharge, laser ablation, and chemical vapor decomposition. Carbon nanotubes have the highest tensile strength and modulus of elasticity of any known material. Their electrical properties depend on their structure, and they can conduct electricity efficiently. Potential applications of carbon nanotubes include electronics, quantum computing, and elevators to space. However, concerns exist regarding their potential toxicity if inhaled.
KDMiller_presentationFinal
This document summarizes research into replacing lead with barium in hybrid perovskite materials for optoelectronics. The researcher aimed to synthesize and characterize methylammonium barium iodide (CH3NH3BaI3) as a potential non-toxic alternative to the commonly used methylammonium lead triiodide. Solution processing was used to combine barium iodide and methylammonium iodide, but characterization techniques like UV-Vis spectroscopy, photoluminescence, and XRD did not show evidence that the intended perovskite material was formed. The film also proved unstable when exposed to air. Further experimentation is needed to determine better synthesis and processing methods.
Characteristics of Perovskite Solar Cells
A comparison among different types of perovskite solar cells.
https://www.orkg.org/orkg/comparison/R139642
CNTFET Based Analog and Digital Circuit Designing: A Review
ABSTRACT: Silicon has been a material of choice for the last many decades and more than 95% of electronics devices are from silicon. However, silicon has reached to its saturation level and extracting more and more performance is difficult and costly now. A new material which has a potential to replace Si and can extend the scalability of devices below 22 nm is the carbon nanotube (CNT). CNT is a wonderful material possesses unique properties that make it a promising future material. CNT based field effect transistor (Cntfet) is a promising basic building block to complement the existing silicon based MOSFET and can result in the extension of the validity of Moore's law further. CNTFT has been used extensively in realizing electronics circuits. This paper presents the state of the art literature related to carbon nanotubes, carbon nanotube field effect transistors and CNTFET based circuit designing. A review of Cntfet based analog and digital circuits has been presented. It has been observed that the use of CNTFET has improved the performance of both analog and digital circuits. The work will be very useful to the people working in the field of CNT based analog and digital circuit designing.
microbial fuel cell
Microbial fuel cells (MFCs) generate electricity through bacteria that catalyze the oxidation of organic and inorganic matter. MFCs have three main components - an anode where bacteria adhere and produce electrons, a cathode where oxygen is reduced, and a membrane separating the two. As bacteria respire, they transfer electrons to the anode which flow through an external circuit to the cathode. MFCs can treat wastewater while generating electricity and have applications for powering remote devices, biosensing, and more. However, challenges remain in scaling up designs and reducing internal resistance for practical applications.
Comps #2
The document summarizes the transition from glass tube transistors to carbon nanotube transistors. It begins by discussing band theory and how doping semiconductors creates an excess or deficiency of charge carriers. Early transistors were based on germanium and the discovery that current could flow between gold and tungsten contacts on a germanium sample with a bias. The document then covers point contact transistors, field effect transistors, bipolar junction transistors and their operating characteristics. Finally, it discusses how carbon nanotube transistors can be used to build logic gates and their advantages over traditional transistors, including flexibility, heat dissipation and ability to be scaled down further.
Investigation of thermal transport in hybrid silicene nanoribbons
In this dissertation, we investigated thermal transport properties of hybrid silicene nanoribbons and studied the concept of interfaces.
More Related Content
What's hot
Diamond chip
Carbon exists in many allotropes that can be used for electronics, such as diamond, graphene, carbon nanotubes, and lonsdaleite. Diamond chips are electronic chips manufactured using a diamond wafer that is doped to make it conductive. Carbon nanotubes have many desirable properties including strength, hardness, electrical and thermal conductivity, and can operate at higher temperatures than silicon chips. Potential applications of diamond chips and carbon nanotubes include information and communications technology, materials, biomedical devices, energy, transportation, and consumer goods. However, diamond chips are currently more expensive to produce than silicon chips due to the difficulty of doping the diamond structure.
diamond-chip report
1) Diamond chips or carbon chips are electronic chips manufactured using carbon or diamond as the substrate material instead of silicon. Carbon nanotubes are a major component used in carbon chips.
2) Carbon has advantages over silicon such as higher thermal conductivity, ability to withstand higher voltages and temperatures. However, carbon chips are still more expensive than silicon chips and electricity does not flow as smoothly through diamond as silicon.
3) Research is ongoing to address these issues and fully utilize the properties of carbon nanotubes and diamond film for applications like power electronics where their properties would provide benefits over silicon. Carbon chips are not expected to completely replace silicon for at least 20 more years.
Perovskite Solar cells
Perovskite solar cells (PSCs) utilize a perovskite structured compound as the light-harvesting active layer. PSCs consist of a transparent electrode, electron transporting layer, perovskite layer, hole transporting layer, and metallic electrode. When light enters the perovskite layer, electrons and holes are generated and transported through the layers, producing a current. PSCs can be produced through solution deposition methods and have advantages like higher efficiency and lower cost compared to silicon solar cells, but have disadvantages like using costly gold electrodes and short lifespan.
Carbon nanofiber poster
This document summarizes a study that characterized the structure and explored the mechanical properties of carbon nanofibers produced through electrospinning polyacrylonitrile (PAN) polymer precursor. The study used electrospinning to produce PAN nanofibers, which were then oxidized and carbonized. Scanning electron microscopy was used to examine the fiber diameters and structures. The conclusions discussed how processing parameters like voltage, needle diameter, and distance between needle and drum impacted fiber formation and properties. Carbon nanofibers produced through this method showed potential for applications in areas like heat transfer and composite reinforcement.
Carbon Nanotubes
New technology Model for 1 nm Transistors better than FIN-FET Technology.This slide Tells you in general about the nanotubes, how they are formed and why they are better than MOSFETs
Diamond chip
The document discusses a colloquium presentation on diamond chips. Diamond chips are manufactured from diamond structured carbon wafers and use carbon nanotubes as their major component. To make diamond conductive for electronics applications, it must be doped with elements like boron or nitrogen. Carbon nanotubes have excellent electrical and thermal properties and high strength. They allow for smaller, faster components that can operate at high temperatures. While diamond chips provide advantages over silicon, their production is more expensive and doping is more difficult due to diamond's structure. Overall, the presentation suggests that carbon chips may replace silicon in electronics in the future.
KDMiller_MRSEC_Poster_Final
This study aimed to replace lead in perovskite materials with barium to make optoelectronic devices more environmentally sustainable. The researchers synthesized barium iodide and attempted to intercalate methylammonium iodide to form methylammonium barium triiodide perovskite as described in a manuscript by Kumar et al. Characterization of spin-coated films found no evidence of perovskite formation and the solutions degraded when exposed to air, inconsistent with Kumar's results. Further work is needed to explore alternative precursors, synthesis methods, and characterization of any photonic properties.
Diamond Chip
This document discusses the potential for diamond chips to replace silicon chips in electronics. Diamond chips are made from carbon and have several advantages over silicon, including smaller size, faster operating speeds, higher thermal conductivity, and the ability to handle more power. Carbon nanotubes are a key material that enable diamond chip technology by exhibiting metallic or semiconducting properties depending on their structure. While diamond chips are currently more expensive than silicon, their superior properties may allow for smaller, faster, and more powerful electronic devices in the future.
Carbon nanofiber abstract
This document discusses electrospun carbon nanofibers. It begins by noting the interest in carbon nanofibers due to their potential applications and describes typical production methods. It then explains that carbon nanofibers can be produced through pyrolyzing electrospun polymer nanofibers. The document goes on to describe the specific electrospinning process used, utilizing polyacrylonitrile dissolved in dimethylformamide and optimizing the oxidation and carbonization processes to produce carbon nanofibers in the hundreds of nanometers in diameter. The carbon nanofibers were then analyzed using scanning electron microscopy and infrared spectroscopy.
Metal Nanoparticles - Solids
This document discusses how the properties of metallic nanoparticles differ from macroscale particles due to their small size at the nanoscale. It explains that as particle size decreases, the ratio of surface atoms to interior atoms increases. This means the percentage of surface atoms and the average coordination number in the sample decreases. It also impacts properties like melting point, color and reactivity due to the higher proportion of surface atoms.
Fabrication of perovskite solar cell
Project on Methyl Ammonium Lead Iodide solar cell with Copper iodide as hole transport layer and zinc oxide as electron transport layer.
Seminar Report on Carbon Nanotube Field Effect Transistor
This document provides an overview of carbon nanotube field effect transistors (CNTFETs). It discusses the history of carbon nanotubes and how they were first discovered in the late 1880s. It then covers the different types of carbon nanotubes, their properties, and fabrication processes. A key part summarizes the characteristics of CNTFETs compared to traditional MOSFETs, noting advantages like higher speed, scalability and lower power consumption. The document concludes by comparing CNTFETs to MOSFETs and outlining potential future works.
Perovskites-based Solar Cells: The challenge of material choice for p-i-n per...
Perovskite-based PV have triggered widespread interest in the scientific community because these materials offer the attractive combinations of low cost and theoretically high efficiency. However, several challenges must be overcome for these relatively new PV materials. Among the many important challenges, one is the choice of materials to be used in thin film PV devices..
Based on fundamental principles of solar photovoltaics, this problem focuses on two aspects of the perovskite system:
1) Based on a planar p-i-n device structure, a potential list of p- and n-type charge collecting layers as well as the conductive contacts that could be used with a promising perovskite absorber material was identified, and a proper justification for the selection of each material in the device was given.
2) Three theoretical p-i-n type solar cells were made with the chosen materials and appropriate conductive contacts.
UMKC - Perovskite Solar Cells
The document discusses perovskite solar cells (PSCs) and highlights a new hole transport layer (HTL) material invented at the University of Missouri-Kansas City that could improve PSCs. Current PSCs use expensive and unstable HTL materials like spiro-OMeTAD. The new UMKC HTL material is inexpensive, transports charge fast, forms uniform dense films, provides good moisture barrier, and allows PSCs with significantly higher efficiencies and improved stability compared to spiro-OMeTAD. A provisional patent has been filed and further development is needed to fabricate PSCs in a clean room and demonstrate record efficiencies and stability under various conditions.
Perovskite
Perovskite: introduction, classification, structure of perovskite, method to synthesis, characterization by XRD and UV- vis spectroscopy , lambert beer's law, material properties and advantage and application.
carbon nanotubes
Carbon nanotubes are cylindrical carbon molecules that exhibit extraordinary strength, unique electrical properties, and efficient heat conduction. They can be produced via arc discharge, laser ablation, and chemical vapor decomposition. Carbon nanotubes have the highest tensile strength and modulus of elasticity of any known material. Their electrical properties depend on their structure, and they can conduct electricity efficiently. Potential applications of carbon nanotubes include electronics, quantum computing, and elevators to space. However, concerns exist regarding their potential toxicity if inhaled.
KDMiller_presentationFinal
This document summarizes research into replacing lead with barium in hybrid perovskite materials for optoelectronics. The researcher aimed to synthesize and characterize methylammonium barium iodide (CH3NH3BaI3) as a potential non-toxic alternative to the commonly used methylammonium lead triiodide. Solution processing was used to combine barium iodide and methylammonium iodide, but characterization techniques like UV-Vis spectroscopy, photoluminescence, and XRD did not show evidence that the intended perovskite material was formed. The film also proved unstable when exposed to air. Further experimentation is needed to determine better synthesis and processing methods.
Characteristics of Perovskite Solar Cells
A comparison among different types of perovskite solar cells.
https://www.orkg.org/orkg/comparison/R139642
CNTFET Based Analog and Digital Circuit Designing: A Review
ABSTRACT: Silicon has been a material of choice for the last many decades and more than 95% of electronics devices are from silicon. However, silicon has reached to its saturation level and extracting more and more performance is difficult and costly now. A new material which has a potential to replace Si and can extend the scalability of devices below 22 nm is the carbon nanotube (CNT). CNT is a wonderful material possesses unique properties that make it a promising future material. CNT based field effect transistor (Cntfet) is a promising basic building block to complement the existing silicon based MOSFET and can result in the extension of the validity of Moore's law further. CNTFT has been used extensively in realizing electronics circuits. This paper presents the state of the art literature related to carbon nanotubes, carbon nanotube field effect transistors and CNTFET based circuit designing. A review of Cntfet based analog and digital circuits has been presented. It has been observed that the use of CNTFET has improved the performance of both analog and digital circuits. The work will be very useful to the people working in the field of CNT based analog and digital circuit designing.
microbial fuel cell
Microbial fuel cells (MFCs) generate electricity through bacteria that catalyze the oxidation of organic and inorganic matter. MFCs have three main components - an anode where bacteria adhere and produce electrons, a cathode where oxygen is reduced, and a membrane separating the two. As bacteria respire, they transfer electrons to the anode which flow through an external circuit to the cathode. MFCs can treat wastewater while generating electricity and have applications for powering remote devices, biosensing, and more. However, challenges remain in scaling up designs and reducing internal resistance for practical applications.
What's hot (20)
Seminar Report on Carbon Nanotube Field Effect Transistor
Seminar Report on Carbon Nanotube Field Effect Transistor
Perovskites-based Solar Cells: The challenge of material choice for p-i-n per...
Perovskites-based Solar Cells: The challenge of material choice for p-i-n per...
CNTFET Based Analog and Digital Circuit Designing: A Review
CNTFET Based Analog and Digital Circuit Designing: A Review
Viewers also liked
Comps #2
The document summarizes the transition from glass tube transistors to carbon nanotube transistors. It begins by discussing band theory and how doping semiconductors creates an excess or deficiency of charge carriers. Early transistors were based on germanium and the discovery that current could flow between gold and tungsten contacts on a germanium sample with a bias. The document then covers point contact transistors, field effect transistors, bipolar junction transistors and their operating characteristics. Finally, it discusses how carbon nanotube transistors can be used to build logic gates and their advantages over traditional transistors, including flexibility, heat dissipation and ability to be scaled down further.
Investigation of thermal transport in hybrid silicene nanoribbons
In this dissertation, we investigated thermal transport properties of hybrid silicene nanoribbons and studied the concept of interfaces.
Prepararsi al mondo che cambia: Tecnologia, Lavoro, Città
Seminario di Giuseppe Iannaccone per la scuola di Formazione di Ideali. In realtà si è parlato sopratutto di tecnologie e lavoro, poco di città
Carbon nanotubes
This document discusses carbon nanotubes, including their structure, properties, production methods, and applications. Carbon nanotubes have a cylindrical structure composed entirely of sp2 bonds. They have excellent mechanical and thermal properties and can be metallic or semiconducting depending on their structure. Common production methods include arc discharge, laser ablation, and chemical vapor deposition. Potential applications of carbon nanotubes include use in structural materials, electronics, energy storage, and biomedicine. However, health effects of carbon nanotube inhalation require further study.
Understanding graphene nano-ribbon manipulation
This document summarizes research on manipulating and studying graphene nano-ribbons (GNRs) on gold surfaces using atomic force microscopy (AFM). Key findings include:
1) GNRs align along specific crystallographic directions on the gold surface due to surface reconstruction patterns.
2) Static friction forces on GNRs decrease with increasing length, demonstrating the property of superlubricity.
3) Dynamic "stick-slip" motion of GNRs shows periodicity corresponding to the gold surface reconstruction.
4) GNR bending and edge effects influence the stick-slip behavior at different heights above the surface.
5) Computer modeling captures these behaviors and provides insight into friction mechanisms at
10 nanosensors
Nanobiosensors can detect biomolecules on the nano-scale using biological recognition elements connected to transducers. They utilize various types of bio-receptors like antibodies, enzymes, cells that interact with target analytes. This interaction is then converted to optical, electrical, mechanical or magnetic signals via transducers. Nanobiosensors have applications in medical diagnostics, environmental monitoring, food safety testing and more. Some examples include nanowire field effect transistors to detect viruses, graphene oxide immunosensors for disease biomarkers, and magnetic nanoparticle sensors for bacteria.
Master's Thesis Presentation
This document discusses simulations of carbon nanotube, graphene, and silicon nanowire field effect transistors. It outlines objectives to review nanodevices, simulate different nanodevice structures to study characteristics, and compare results. Sections describe the structures, parameters varied in simulation like dielectric constant and channel length, and results showing the impact on performance metrics like on/off ratio. Future work and conclusions note limitations and potential for further simulation to better optimize device design.
Silicene Nanoribbon
This document provides an introduction to a thesis investigating the thermal conductivity of silicene nano-ribbons. Silicene is a two-dimensional allotrope of silicon that forms a hexagonal honeycomb structure similar to graphene. Using scanning tunneling microscopes, silicene nano-ribbons can be self-assembled and studied. The objectives of the thesis are to examine how the thermal conductivity of silicene nano-ribbons is affected by length, isotopic doping, applied tensile strains, chirality, and the addition of hydrogen atoms. Atomistix Virtual Nano Lab software will be used to simulate and analyze the physical properties at the nano-scale through density functional theory calculations.
nanotech
Carbon nanotubes and other nanomaterials have a wide variety of applications in medicine, environmental remediation, energy, space exploration, food, fabrics, and sports goods. However, there are also some disadvantages to nanotechnology that need to be addressed, such as potential health risks from exposure to certain nanomaterials.
Carbon nanotubes
This document discusses carbon nanotubes. It describes carbon nanotubes as having a diameter as small as 1nm and being made of rolled graphene sheets. Carbon nanotubes can be single-walled, multi-walled, or double-walled. They have extraordinary properties including high tensile strength, electrical and thermal conductivity. Potential applications include conductive plastics, structural materials, electronics, and biosensors. Common fabrication methods are electric arc discharge, laser ablation, and chemical vapor deposition.
Graphene nanoribbons
Graphene is a one-atom-thick planar sheet of sp2-bonded carbon atoms that are densely packed in a honeycomb crystal lattice
The name ‘graphene’ comes from graphite + -ene = graphene
GNR FET
The document discusses graphene and graphene nanoribbon field-effect transistors (GNR FETs). It begins by defining graphene as a single layer of carbon atoms in a honeycomb lattice structure. It then discusses the history of graphene research and the 2010 Nobel Prize awarded for its discovery. The document evaluates the structure and advantages of graphene FETs, including higher electron mobility. It introduces GNRs as ultra-thin strips of graphene and evaluates their applications, such as room-temperature high on/off ratios in suspended GNR FETs. In conclusion, potential applications of GNR FETs include improved conductivity and efficiency in electronics.
CNTFET
Carbon nanotube field-effect transistors (CNTFETs) have advantages over traditional MOSFETs by avoiding issues like short channel effects and high leakage currents that arise from continuous MOSFET scaling. CNTFETs use carbon nanotubes that can be metallic or semiconducting depending on their structure. They have a similar structure to MOSFETs but current flow depends on ballistic transport and electron confinement in the CNT. CNTFETs also have lower quantum capacitance than MOSFETs, resulting in lower propagation delay. Neural networks are well-suited for modeling CNTFETs with their simple, continuous equations that can account for channel length variations. However, precisely controlling CNT
Graphene Transistor By Shital Badaik
The document discusses graphene and its potential use in transistors. It describes graphene as a single sheet of carbon atoms arranged in a honeycomb lattice. Researchers have shown that stacking a few layers of graphene could enable optical switches that are 100 times faster than current technologies. The document also details experiments where graphene field-effect transistors were fabricated with gate lengths down to 150nm, achieving a cutoff frequency of 26GHz. Scaling to smaller gate lengths allows higher frequencies, with cutoff frequency scaling inversely with the square of the gate length. Graphene has potential for high-frequency and versatile applications due to its high carrier mobility and small channel lengths.
Cntfet
This document discusses carbon nanotube field-effect transistors (CNTFETs) as a potential substitute for MOSFETs. CNTFETs could help overcome limitations of MOSFET scaling by providing higher carrier mobility, excellent electrostatics, and gate control. CNTFETs exhibit advantages like better threshold voltage and subthreshold slope control as well as higher current density compared to MOSFETs. However, mass production of CNTFETs faces challenges related to defects, failure rates, and degradation when exposed to oxygen that need to be addressed before widespread implementation.
Cnt devices
CNT devices have received attention since their discovery in 1991 due to their potential applications. Straining CNTs less than 1% can change them from metal to semiconductor. The encapsulated fullerenes inside CNT peapods can rotate freely and affect the electronic properties. Semiconducting behavior in CNTs was first reported in 1998, showing conductance changes of many orders of magnitude when a gate voltage is applied. CNT field-effect transistors have been shown to exhibit behavior analogous to MOSFETs, with the CNT acting as the semiconductor channel.
CNFET Technology
The document summarizes carbon nanotube field effect transistors (CNFETs). It discusses how CNFETs offer advantages over traditional MOSFETs such as ballistic transport, high drive current, temperature resilience, and low capacitance. However, large-scale manufacturing of CNFETs poses challenges and circuit performance can only be estimated through simulations currently. The document also describes the structure, properties, types and performance of CNFETs. It analyzes how CNFET design can overcome issues facing MOSFET scaling like leakage and process variation.
Graphene Field Effect Transistor
This document provides an overview of graphene field effect transistors (GFETs). It first discusses the theory of graphene, including the structure and electronic properties of monolayer and bilayer graphene. It then describes two types of GFETs: bilayer graphene field effect transistors and graphene nanoribbon field effect transistors. For bilayer GFETs, it covers how an applied electric field can break the symmetry and open a bandgap, the device electrostatics, characteristics of an actual dual-gated device, and how the bandgap and charge neutrality point can be tuned. For graphene nanoribbons, it briefly discusses how electronic confinement based on the ribbon edge structure and decreasing the ribbon width can produce bandgaps suitable for
PPT thesis defense_nikhil
h-BN has potential as an ideal dielectric material for 2D electronics. As a gate dielectric, h-BN provides improved carrier mobility and resists dielectric breakdown at high electric fields. When used as a substrate, h-BN enhances graphene conductivity and mobility while improving reliability by facilitating better heat dissipation than conventional dielectrics like SiO2. Overall, h-BN shows promise as an ubiquitous dielectric that can fulfill critical roles in 2D heterostructures and devices.
Graphene transistors and two-dimensional electronics
This document discusses using graphene for electronic devices. It describes how graphene's zero bandgap is problematic for digital electronics but its high mobility makes it promising. Several approaches are presented to induce a bandgap, including using graphene nanoribbons, applying a vertical electric field to bilayer graphene, and creating lateral heterostructures with materials of different bandgaps. Modeling shows these approaches can effectively control the band structure and enable transistor operation. Challenges remain in fabricating devices with sufficient reproducibility and without degrading carrier mobility. Lateral heterostructure FETs are identified as one of the most promising device concepts.
Viewers also liked (20)
Investigation of thermal transport in hybrid silicene nanoribbons
Investigation of thermal transport in hybrid silicene nanoribbons
Prepararsi al mondo che cambia: Tecnologia, Lavoro, Città
Prepararsi al mondo che cambia: Tecnologia, Lavoro, Città
Graphene transistors and two-dimensional electronics
Graphene transistors and two-dimensional electronics
Similar to Carbon nanotubes zoe sawyer
carbon nanotubes
Carbon nanotubes and their applications are discussed. There are several allotropes of carbon including diamond, graphite, buckminsterfullerene (C60), and single-walled carbon nanotubes. Carbon nanotubes are cylindrical forms of carbon that can be single-walled or multi-walled. They are composed of hexagonal networks of carbon atoms and have remarkable mechanical, thermal, and electrical properties. Common synthesis methods for carbon nanotubes include arc discharge, laser ablation, and chemical vapor deposition using metal catalysts.
Carbon NanoTubes
Carbon nanotubes were discovered in 1991 and are long thin cylinders of carbon with remarkable strength and other properties. They exist in single-walled and multi-walled forms and can be metallic or semi-conducting depending on their structure. Common synthesis methods are arc discharge, laser ablation, and chemical vapor deposition. Carbon nanotubes have a wide range of applications from concrete and sports equipment to future uses like space elevators. Their increasing production and applications are expected to help address problems like pollution.
seminar report for carbon nanotubes
consists literature review, classification,synthesis methods, properties, advantages and limitations, applications,etc
Carbon nanotube
This document discusses carbon nanotubes (CNTs). CNTs were first discovered in 1991 and have a nanoscopic cylindrical structure. There are two main types: single-walled and multi-walled. CNTs can be synthesized through arc discharge, chemical vapor deposition, and laser ablation methods. CNTs have extraordinary mechanical and thermal properties, such as being 200 times stronger than steel but also excellent conductors of electricity and heat. Potential applications include use in bulletproof vests, water filters, and other future technologies. However, challenges remain around production mechanisms and skilled workforce development.
CNT-Properties
Carbon nanotubes are cylindrical carbon molecules that exhibit extraordinary properties. They can be single-walled or multi-walled depending on the number of coaxial layers of graphite. Carbon nanotubes are very strong, light, and can be metallic or semiconducting depending on their structure. They are synthesized through arc discharge, laser ablation, or chemical vapor deposition methods.
carbon nanotubes
Carbon nanotubes are cylindrical carbon molecules that exhibit extraordinary strength and unique electrical properties. They can be produced through arc discharge, laser ablation, and chemical vapor decomposition. Carbon nanotubes have the highest tensile strength and modulus of elasticity of any known material. They are also very good conductors of heat and electricity. Potential applications of carbon nanotubes include building elevators into space, creating novel transistors smaller than conventional ones, and representing quantum bits for quantum computing. However, carbon nanotubes may pose health risks if inhaled in small sizes similar to asbestos fibers.
swarnav paper_2
This document provides an overview of carbon nanotubes, including their unique properties, production methods, and applications. Carbon nanotubes are extraordinarily strong and stiff, and can be metallic or semiconducting depending on their structure. There are several methods for producing carbon nanotubes, including arc discharge, laser ablation, and chemical vapor deposition. Carbon nanotubes show promise for applications in energy storage, healthcare, and environmental remediation due to their mechanical, electrical, and thermal properties.
CARBON NANOTUBES
Carbon nanotubes are cylindrical nanostructures made of rolled up graphene sheets with extraordinary mechanical and electrical properties. They can be single-walled or multi-walled depending on the number of concentric cylinders. Carbon nanotubes have a wide range of potential applications due to their strength, conductivity, and other properties including use in electronics, sensors, energy storage, and more. However, their toxicity must still be addressed before many applications.
Carbon nanotubes bc
Carbon nanotubes are allotropes of carbon that are extremely small, with diameters on the nanometer scale. They have a variety of potential applications due to their unique properties like strength, conductivity, and thermal properties. Some applications discussed include use in clothing, electronics, displays, filters, and hydrogen storage. However, concerns remain about their potential toxicity and more research is needed to address public confusion and fully realize their promise.
Carbon nanotubes properties and applications
This document discusses carbon nanotubes and their history and discovery. It begins by providing background on carbon nanotubes, describing their cylindrical nanostructure and how they are made by rolling graphene sheets into cylinders. It then discusses the history and discovery of carbon nanotubes, including the discovery of fullerenes in 1985 and carbon nanotubes themselves in 1991 by Sumio Iijima. The document concludes by classifying the two main types of carbon nanotubes as single-walled and multi-walled nanotubes.
Lect 4 carbon age
This document provides an overview of carbon and nanocarbon materials presented by Prof. Mohamed Khedr. It discusses the properties of carbon including its melting point and use as the basis for organic compounds. It then describes various forms of nanocarbon including fullerenes, carbon nanotubes, graphene, and carbon black. The document outlines different classifications of carbon nanotubes and provides examples of potential applications for carbon nanomaterials in fields like electronics, energy storage, sensors and displays. In summary, Prof. Khedr presents information on the structure and properties of carbon allotropes with a focus on emerging applications of nanocarbon materials.
Carbon nanotubes
This document discusses carbon nanotubes, including their discovery in the 1950s, classification as single-walled or multi-walled nanotubes, properties like strength and conductivity, common synthesis methods like arc discharge and chemical vapor deposition, and potential applications such as for solar cells, sporting goods, and neural networks. It also notes potential health risks from short carbon nanotubes and the need for further research on impacts.
Carbon nanotubes
This document provides information about carbon nanotubes. It begins with an acknowledgement and introduction section describing carbon nanotubes. It then discusses the history, chemistry, types (single-walled and multi-walled), methods of preparation (arc evaporation, laser vaporization, chemical vapor deposition), electrical and thermal properties, defects, and applications (water filtration, strengthening materials, capacitors, bone repair, displays, energy storage). It also notes potential health hazards from inhalation of short carbon nanotubes.
Carbon nanotube
Carbon nanotubes are hexagonally shaped arrangements of carbon atoms that have been rolled into tubes. They have extraordinary strength and unique electrical properties, and are efficient thermal conductors. Carbon nanotubes exist as single-walled nanotubes or multi-walled nanotubes, and have a variety of potential applications due to their novel properties.
CNT based cell Seminar
This document summarizes a seminar presentation on carbon nanotube based solar cells. It begins with an introduction to carbon nanotubes, describing their cylindrical nanostructure formed from graphene sheets rolled at specific angles. It then discusses properties of carbon nanotubes that make them suitable for solar cells, such as their electrical conductivity. The document reviews three generations of solar cell technology and their limitations before describing how carbon nanotubes can be incorporated into dye-sensitized solar cells as transparent electrodes, replacing conventional materials like ITO. It presents results showing a carbon nanotube-based solar cell achieved 7.04% efficiency compared to 7.34% for a standard platinum electrode cell. In conclusion, carbon nanotube electrodes
Gregory g. et-al-2006-small
This document summarizes methods for functionalizing carbon nanotubes (CNTs) with metal nanoparticles and applications of the resulting materials. It discusses several electrochemical methods for depositing metal nanoparticles onto CNTs, such as electrodeposition of noble metals like Pt, Pd, and Au. Electrochemical deposition allows control over nanoparticle size and distribution and produces high purity nanoparticles. The document also discusses chemical deposition methods and how the functionalized CNT materials can be used in applications like catalysis and fuel cells.
applications of nanotubes.pptx
This document discusses the electron emission effect of carbon nanotubes and some of its applications. When a small electric field is applied parallel to a nanotube, electrons are emitted from its ends. This field emission effect can be used in flat panel displays and vacuum tube lamps. Carbon nanotubes also have potential applications in batteries, fuel cells, electromagnetic shielding, and as sensors for detecting gases. Adding carbon nanotubes to materials like polypropylene and aluminum can significantly increase their tensile strength, making nanotubes promising for composite reinforcement.
ETE444-lec4-Carbon-Nanotubes.ppt
- Carbon nanotubes were discovered accidentally in the 1990s and have properties that could revolutionize technology. They are sheets of graphene rolled into cylindrical shapes that are only a few nanometers wide but can be hundreds of micrometers long.
- Carbon nanotubes are incredibly strong yet lightweight. A single-walled carbon nanotube can be up to 100 times stronger than steel relative to its thickness. They also conduct heat and electricity very well.
- Potential applications of carbon nanotubes include use in composite materials, electronics, energy storage, sensors, and biomedical devices due to their unique mechanical and electrical properties at the nanoscale.
ETE444-lec4-Carbon-Nanotubes.ppt
- Carbon nanotubes were discovered accidentally in the 1990s and have properties that could revolutionize technology. They are sheets of graphene rolled into cylindrical shapes that are only a few nanometers wide but can be hundreds of micrometers long.
- Carbon nanotubes are incredibly strong yet lightweight. A single-walled carbon nanotube can be up to 100 times stronger than steel relative to its thickness. They also conduct heat and electricity very well.
- Potential applications of carbon nanotubes include use in space elevators, hydrogen fuel cells, artificial muscles, electronics, sensors, and as reinforcements in composite materials. They are being researched for uses in fields like energy storage, medicine, and electronics.
Carbon nanotubes
The presentation must be downloaded, since there are power-point effects which makes it hard to see the full content without downloading the file.
Similar to Carbon nanotubes zoe sawyer (20)
Carbon nanotubes zoe sawyer
- 1. Carbon Nanotubes A General Overview Of Zoe Sawyer, Charlie West, and Patrick Keyser
- 2. Carbon nanotubes- sheets of graphite rolled up and capped at both ends by half of C60 molecule ● C60 = molecular form of carbon ● Carbon nanotubes were discovered soon after discovery of C60 Carbon Nanotubes carbon nanotube
- 3. 2 Types of carbon nanotubes Multi-Walled and Single Walled 1. Microwall ○ Tubes within tubes, nested together 2. Single-walled ○ Single tubes ○ Length= 100 nm long, diameter= 1nm Single and multi walled carbon nanotubes
- 4. Conductors Versus Semiconductors 1. Diameter (and the way in which the sheet of graphene is rolled) determines whether the tube is a conductor or semiconductor ○ can become semiconductors without doping ■ Doping = adding small amounts of impurity atoms to semiconductors ■ This makes carbon unique from all other solid- state materials
- 5. Conductors Versus Semiconductors ○ Because carbon nanotubes can be semiconductors or conductors, there is interest in building nanoscale electronic circuits using only carbon nanotubes ■ The first field effect transistor (FET) built using a single carbon nanotube, 1998 ■ A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power a 3-D depiction of a nanoscale electronic circuit using multiple carbon nanotubes One of the many different types of single carbon nanotube FET's
- 6. Exploration for Mechanical Properties 1. Carbon-carbon bonded framework= eliminates imperfections ■ Imperfections DO occur in metal nanowire 2. Carbon nanotubes are stronger than a same sized sample of steel 3. They have been spun into with polymers ■ Adds great strength and durability to the composite material
- 7. Works Cited Brown, Theodore L., H. Eugene LeMay, and Bruce Edward. Bursten. Chemistry: The Central Science. Upper Saddle River, NJ: Prentice Hall, 2000. Print. CNT Illustration. Model. Electronic and optical properties: carbon nanotubes. 8 Aug 2006. Web. 22 April 2013. Field Effect Transistor. Animation. NIMS. n.d. Web. April 22 2013. Post Silicon PTM. Model. Interactive modeling and online simulation platform. 14 August 2012. Web. 22 April 2013. Schematic diagrams of single-wall carbon nanotube (SWCNT) and multi-wall carbon nanotube (MWCNT). Diagram. Intech. 17 Aug 2011. Web. 22 April 2013.