This document summarizes the fabrication and characterization of nanowire devices. It discusses the early history of nanotechnology and how the field has progressed. Various methods for synthesizing semiconductor nanowires are described, including vapor-liquid-solid growth and electrodeposition. The document shows images of nanowires made from materials like copper, cadmium sulfide, and zinc oxide. It also discusses the unique electrical and optical properties of nanowires and their potential applications in areas such as electronics, optoelectronics, and sensing. In conclusion, the author remarks that nanowires may serve as important building blocks for next-generation electronic and optoelectronic systems by enabling new device concepts.
This presentation contains a basic introduction to quantum dots,their discovery, properties, applications,advantages,limitations and future prospects.It also contains a brief overview of experimental work carried out and results obtained during my summer term project.
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
Classification of Nanostructures by Peeyush MishraPeeyush Mishra
In this presentation, I have tried to define Nanostructures and discuss various types of Nanostructures. I have also compared the ways in which Nanomaterials can be synthesized.
Introduction to nanoparticles and bionanomaterialsShreyaBhatt23
what is a nanoparticle, why small is good,nanoscale effect, how to make nanostructures,top down and bottom up approachs,
methods of making nanomaterials,chemical methods od making nanomaterial,bionanomaterials,
Nanotechnology & its Nanowires Application (By-Saquib Khan)SAQUIB KHAN
Appropriate presentation for Nanotechnology & Nanowires Application. along with Nanowiresbattery.
By- SAQUIB KHAN
B.TECH.MECHANICAL ENGG.(First Year)
INTEGRAL UNIVERSITY
Lucknow
This presentation contains a basic introduction to quantum dots,their discovery, properties, applications,advantages,limitations and future prospects.It also contains a brief overview of experimental work carried out and results obtained during my summer term project.
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
Classification of Nanostructures by Peeyush MishraPeeyush Mishra
In this presentation, I have tried to define Nanostructures and discuss various types of Nanostructures. I have also compared the ways in which Nanomaterials can be synthesized.
Introduction to nanoparticles and bionanomaterialsShreyaBhatt23
what is a nanoparticle, why small is good,nanoscale effect, how to make nanostructures,top down and bottom up approachs,
methods of making nanomaterials,chemical methods od making nanomaterial,bionanomaterials,
Nanotechnology & its Nanowires Application (By-Saquib Khan)SAQUIB KHAN
Appropriate presentation for Nanotechnology & Nanowires Application. along with Nanowiresbattery.
By- SAQUIB KHAN
B.TECH.MECHANICAL ENGG.(First Year)
INTEGRAL UNIVERSITY
Lucknow
Nanotechnology has to potential to revolutionize the US energy system. From fuel cells, to cell phone batteries, to space equipment, and everywhere in between nanotechnology can be utilized.
But, there is still a lot of research to be done and many hurdles to cross to make this technology commercially practicable.
A nanogeneratoris a nanoscale device capable of generating electric current, or electromagnetic fields for the use in various fields. With these nanogenerators, the mechanical energy can be harnessed to recharge electronic gadgets. Zhong LinWang, professor in Georgia Institute of Technology invented this technology. The nanogenerator he made could produce 4W per cc of the nanowire. The working principle of nanogenerator is the PIEZOELECTRIC EFFECT; a phenomenon displayed by certain materials where mechanical stress is converted to electric current. This effect is closely related to a change of polarization density within the material’s volume. If the material is not short circuited, the applied stress induces a voltage across it.Thenanogenerator is made up of zinc oxide wires. These nanowires being piezoelectric, produces a small electrical pulse when subjected to mechanical stress like body movements or even light breeze.
Enhanced field electron emission of flower like zinc oxide on zinc oxide nano...Suhufa Alfarisa
For the first time, zinc oxide (ZnO) nanoflowers on ZnO nanorods were produced on carbon nanotubes
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This Presentation is based on our Research work carried out in GNDU Amritsar and DAVIET, Jallandhar. We fabricated Ion track filters; nanowires and some Exotic Patterns for the first time in India using simple Techniques.
Introduction to nanoscience and nanotechnologyaimanmukhtar1
Introduction of nanoscience/nanotechnology ,properties/potential applications of nanomaterials and electrodeposition of metal single component and alloy nanowires in AAO template
Ion tracks technology proved to be a precursor to Nanotechnology; a technique used in our Laboratory for almost 25 years, with collaboration of GSI, Darmstadt, Germany.
Using Reverse Micelle and Hydrothermal Techniques, we created a variety of Nanocrystals, Nanorods, Quatum dots etc. in our Laboratory at DAVIET, Jallandhar ( 2008-2011).
Metallic nanoparticles (MNPs) is a type of nanoparticle which have a metal core composed of inorganic metal or metal oxide that is usually covered with a shell made up of organic or inorganic material or metal oxide.
the branch of technology that deals with dimensions and tolerances of less than 100 nanometres, especially the manipulation of individual atoms and molecules.
An introduction to nano-science and nanotechnology, now in English !!
I am sorry about mistakes like "Fisics" instead of "Physics" and "alone atoms" where should be "sinlge atoms".
=)
This Lecture was delivered on Science Day celebrations held in SUS College of Engg. & Technology, Tangori. It covers problems of Science education in India at School level, with particular reference to Punjab state. Problems are highlighted but no simple solutions are offered by theAuthors contributions are
Most Scientists Use Chemical Route for Fabrication of Nanomaterials. We also used this route for Nanotechnology.
Reverse Micelle, Hydrothermal, Solvothermal and Co-Precipitation methods are discussed.
Lecture Presented at Solid State Nuclear Track Detectors (SSNTD) Conference held at GND University held at Amritsar 2oo9. It deals with Ion Tracks Route to Nanotechnology.
Ion Tracks are very Fascinating for both Theoretical and Applied areas of Research. We have used Ion Tracks as a route to nanotechnology, creating Devices known as Ion Track Filters or Membranes.
It is a Lecture based on MY ESSAY published in MY Book "Scientific Vision in Sri Guru Granth Sahib and Interfaith Dialogue. A comparison of Cosmological Ideas in Religion and Science is made based on Big Bang Model.
Phosphors are materials useful for TL Dosimeters. SK Omanwar made a major contribution to this Paper presented at Nanoscience Conference held in Lucknow University on 21-23 Dec. 2013.
We proposed Single Activation Energy Model for Radiation Damage in SSNTDs, including most of Insulators, for example, Glasses, Polymers and Mineral Crystals. My Ph.D. Scholars,SK Modgil, RK Bhatia, and Gurinder Singh made major contributions in improving this model.
Puran Singh was a great Scientist, Poet and Philosopher, who went to study in Tokyo university (1900-03) at the age of 19. He was a revolutionary in Japan, became a Buddhist, then a Vedanti and returned to Sikhi in a big way. He created new paradigms in Punjabi Literature and deserved a Nobel Prize but he was not sponsored by any Sikh organization! This Lecture was delivered in GND University, Amritsar on 29th January, 2014.
This Lecture was delivered recently in a National Seminar on Man-Nature Relationship in GURU NANAK DEV University, Amritsar. The Sikh View of Man-Nature Relationship and Environmental Ethics is presented. I wonder why the Original Gurbani Quotes in Gurmukhi Fonts do not appear in PPP.
This is an Introductory Lecture based on the research work done in my Lab. in GNDU Amritsar by Sanjit Amrita Kaur and GS Randhawa during their Ph.Ds. Both are serving in Khalsa College Amritsar. Ion Track Filters were used for first time in separating Cancer Cells from blood of Cancer patients in Govt. Medical College Amritsar by Sanjit & her Sister, a doctor.
This Presentation was given in Guru Kashi University Talwandi Sabo (2013) at the inaugural ceremony of Ph.D. program. Bibliography is added for sake of References.
India is a country of Disasters. We are looking into Disaster Management as a basic problem of India. Our own work in the field of Earthquakes is also discussed.
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2. Birth of Nanotechnology
“There's Plenty of Room at the Bottom”
• On December 29, 1959, Richard P. Feynman
gave the seminal talk at a meeting at Caltech
of the American Physical Society. He
presented a vision of the precise manipulation
of atoms and molecules so as to achieve
amazing advances in information technology,
mechanical devices, medical devices, and
other areas.
3. Changing Idea into Reality
Eric Drexler of MIT, the Chemist, established
the modern field of nanotechnology, with a
draft of his seminal Ph.D. thesis in the mid
1980s. His 1991 doctoral thesis at MIT was
revised and published as the book
"Nanosystems, Molecular Machinery
Manufacturing and Computation" (1992),
which received the Association of American
Publishers award for Best Computer Science
Book of 1992.
4. The Incredible Tininess of Nano
Billions of nanometers
A two meter tall male is
two billion nanometers.
The pinhead
sized dot is a
million nm
Biological
cells size is
Thousands
of nm
DNA Molecules
are about 2.5
nm in width
Hydrogen atom
spans 0.1 nm
2 Uranium
atoms span 1 nm
7. Introduction to Nanowires
Nanowires of metallic and semi-conducting
materials have drawn a lot of research
interest because of their potential
applications in fields like nanoelectronics,
opto-electronics and sensors. Nanowires
exhibit unique electrical, magnetic, optical,
thermoelectric and chemical properties
compared to their bulk counterpart. Electronic
conduction takes place both by bulk
conduction and through tunneling
mechanism.
8. Special Characteristics
• Nanowires exhibit high density of electronic
state.
• They have diameter-dependant band gap.
• They show enhanced surface scattering of
electrons and phonons.
• They have increased excitation energy, high
surface to volume ratio and large aspect ratio.
9. Fundamental Features
• One-dimensionality
• – Wire diameter: several nm ~ hundreds of nm’s
• – Aspect ratio: L:D >10:1
• Material integrity
• – Single crystalline nanostructure
• Availability of numerous materials
• – Superconductor, metal, semiconductor, insulator
• Unique physical properties
• – Large surface-to-volume ratio
• – High transport/carrier mobility
• – Quantum confinement/tunable band structure
10. Quantum Confinement Effects
– Quantum dots (0-D): confined states, and no
freely moving ones
– Nanowires (1-D): particles travel only along the
wire direction
– Quantum wells (2-D): confines particles within a
thin layer
There is no confinement
effect in Bulk materials.
Refer to energy distribution.
12. Growth of Semiconductor Nanowires
by VLS method
Laser ablation overcomes thermodynamic
equilibrium constraints and enables liquid
nanocluster formation.
13. GaN Nanowires Grown by VLS method
SEM image of GaN nanowires of diameters
10nm and lengths on the order of 10m (Huang
et al., 2002).
14. ZnO Nanowires on Sapphire by VLS
method
SEM images of ZnO nanowire arrays grown on a sapphire substrate, (a)
shows patterned growth, (b) shows a higher resolution image of the
parallel alignment of the nanowires, and (c) shows the hexagonal cross-
section of the nanowires (Huang et al., 2001).
15. Nano-Lasers using ZnO Nanowires
ZnO nanowires grown by VLS method.Emission spectrum from ZnO nanowires.
16. Nanowire Fabrication
Template synthesis using polymer and anodic
alumina membranes
Electrochemical deposition
Ensures fabrication of electrically continuous wires
since only takes place on conductive surfaces
Applicable to a wide range of materials
High pressure injection
Limited to elements and heterogeneously-melting
compounds with low melting points
Does not ensure continuous wires
Does not work well for diameters < 30-40 nm
Chemical Vapor Deposition (CVD) or VLS technique
Laser assisted techniques
19. Anodization of aluminum
Start with uniform layer of ~1µm Al
Al serves as the anode, Pt may serve as the cathode, and
0.3M oxalic acid is the electrolytic solution
Low temperature process (2-50
C)
40V is applied
Anodization time is a function of sample size and distance
between anode and cathode
Key Attributes of the process (per M. Sander)
Pore ordering increases with template thickness – pores are
more ordered on bottom of template
Process always results in nearly uniform diameter pore, but not
always ordered pore arrangement
Aspect ratios are reduced when process is performed when in
contact with substrate
Anodic Alumina Template Preparation
20. Electrochemical mechanism
• The overall reaction that takes place during
anodization is:
2Al + 3H2
O => Al2
O3
+ 3H2
At the anode:
2Al + 3O2-
=> Al2
O3
+ 6e-
At the cathode:
6H+
+ 6e-
==> 3H2
• The Al is oxidized at the metal/oxide
interface
• The oxide is etched away by the acid with
the applied potential
• The pores are induced by the roughness of
the top surface
TEM micrographs
21. (T. Sands/ HEMI group http://www.mse.berkeley.edu/groups/Sands/HEMI/nanoTE.html)
Anodic alumina (Al2O3) Template
100nmSi substrate
alumina template
(M. Sander)
25. Electrochemical Synthesis
• Electrochemistry has been used to fabricate
nanowires of Cu and heterojunctions of Cu-Se
and Cd-S. The results of our investigations can
be exploited for fabrication of nanodevices for
application in opto-electronics and nano-
electronics. During failure of our Experiments,
exotic patterns ( nanoflowers, nanocrystals,
nanobuds) were produced under nature’s self
assembly.
26. Template Synthesis of CopperTemplate Synthesis of Copper
NanowiresNanowires
The electro-deposition of metals is identical toThe electro-deposition of metals is identical to an
electroplating process. Polymer ITFs and anodicand anodic
alumina can be used as a template. The electrolytealumina can be used as a template. The electrolyte
used here is CuSO4.5H2O acidic solution. The rate ofused here is CuSO4.5H2O acidic solution. The rate of
deposition of metallic film depends upon: currentdeposition of metallic film depends upon: current
density, inter-electrode distance, cell voltage,density, inter-electrode distance, cell voltage,
electrolyte concentration, pH value and temperatureelectrolyte concentration, pH value and temperature
etc. In our case, electrode distance was kept 0.5 cmetc. In our case, electrode distance was kept 0.5 cm
and a current of 2mA was applied for 1 hour. Theand a current of 2mA was applied for 1 hour. The
developed nanostructures were scanned under SEMdeveloped nanostructures were scanned under SEM
for morphological and structural studies.for morphological and structural studies.
43. XRD spectrum of Cu nanowiresXRD spectrum of Cu nanowires
Position [°2Theta] (Copper (Cu))
30 40 50 60 70 80 90
Counts
0
400
1600
Cu polycrystalline
44. SEM Image of CdS NanowiresSEM Image of CdS Nanowires
49. A Billion Dollar Question …
• What can nanowires offer for semiconductor
nanoelectronics?
• Nonlithographic & extremely cost-effective
• Reduced phonon scattering: High carrier
mobility but reduced thermal conductance(?)
• Tunable electrical/optical properties
• Large surface-to-volume ratio: Sensor
sensitivity & memory programming efficiency
50. Advantages of 1-D Nanowires
• High-quality single-crystal wires with nearly
perfect surface
• Scalable nanostructure with precisely
controlled critical dimensions
• Best cross-section for surround-gate CMOS
• Very cost-effective materials synthesis
• High transport low-dimensionality structure
• May use as both device and interconnect for
ultra-compact logic (e.g., SRAM)
51. Nanowire Field-Effect Transistor
• Ambipolar transport
• Carrier mobility study
• Quantum effect
A single device for numerous applications
Device physics study
52. Quantum-Wire Device
M. Bjork (Nano Letters, Sept. 2004)
1. In-situ control of nanowire synthesis allows design of strongly confined
quantum mechanical systems inside nanowires, possibly useful for SET .
2. Next-generation nanoelectronic devices with extremely-low power, high
performance, and radiation tolerance.
56. Role of Nanowires for Next-
Generation Electronics
• The chemical and physical characteristics of
nanowires, including composition, size,
electronic and optical properties, can be
rationally controlled during synthesis in a
predictable manner, thus making these
materials attractive building blocks for
assembling electronic and optoelectronics
nanosystems.
57. Some Observations & Remarks
• Nanotechnology will be the driving force for
next technology revolution.
• Nanowires open door to a wonderland where
the next generation electronics would emerge.
• Scope for innovating new synthesis method
and complex functional nanostructures.
• New device and interconnect concepts will
emerge from horizon, driven by materials
synthesis.
58. Our Publications
• My website: http:// drhsvirk.weebly.com
for list of our published research papers.
Go to www.docstoc.com for purchase of
reprints.
Free download of Review Paper on Nanowires:
visit: ttp://www.intechopen.com/articles/show
• Chapter 20 of Book “Nanowires - Implementations
and Applications”, InTech Open, Abbass Hashim
(Ed).
59. AcknowledgementsAcknowledgements
• Reimer Spohr & Christina Trautman (GSI, Darmstadt)Reimer Spohr & Christina Trautman (GSI, Darmstadt)
• Sanjit Amrita Kaur (GND University, Amritsar)Sanjit Amrita Kaur (GND University, Amritsar)
• Vishal, Gurmit, Sehdev & KK (DAVIET, Jalandhar)Vishal, Gurmit, Sehdev & KK (DAVIET, Jalandhar)
• Dr SK Mehta, Chemistry Deptt. (PU, Chandigarh)Dr SK Mehta, Chemistry Deptt. (PU, Chandigarh)
• CSIO Chandigarh & IIT Roorkee for FESEM & TEM facility.CSIO Chandigarh & IIT Roorkee for FESEM & TEM facility.
• SEM & TEM facility (SAIF, PU, Chandigarh)SEM & TEM facility (SAIF, PU, Chandigarh)
• Rajeev Patnaik (Geology Deptt., PU, Chandigarh)Rajeev Patnaik (Geology Deptt., PU, Chandigarh)
• DAV MC, New Delhi for Research Grants.DAV MC, New Delhi for Research Grants.
• Dr. MS Atwal, VC, Eternal University, Baru Sahib.Dr. MS Atwal, VC, Eternal University, Baru Sahib.