Cvd grown monolayered mo s2 as an effective photosensor operating at low-voltage
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We report the fabrication of a photosensor based on as-grown single crystal monolayers of MoS2 synthesized by chemical vapor deposition (CVD).
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The single crystal of MoSe2 grown by
chemical vapour transport (CVT)technique are used for the
fabrication of Photoelectro chemical (PEC) solar cells. The
effect of the illumination intensity on the conversion efficiency
of the fabricated PEC solar cell is studied.
TCS3200 BASED COST EFFECTIVE FIRE DETECTION MODULE FOR AUTONOMOUS SECURITY SY...
TCS3200 BASED COST EFFECTIVE FIRE DETECTION MODULE FOR AUTONOMOUS SECURITY SY...International Journal of Technical Research & Application
and Heat. The smoke sensors function by
detecting the presence of smoke particles either in a
photoelectric chamber or in an ionization chamber.
These sensors being placed on the ceiling Fire is seldom
detected in the incipient stage.
Loss due to fire damage not only accounts for
equipment and property destruction, but also loss of
data, interruption of service, cleanup and recovery cost.
On an average about $250,000 per incident.
The key to control these damages are not only
to detect fire as early as possible but also identify
exactly the origin of incident. All over the world the
latest technologies are being tested upon and
implemented to detect the fire at early stage. However
these require expensive proprietary solutions and may
not be easily deployable in existing infrastructure.
Technologies do exist today to detect fire at an
early stage but are expensive in nature and requires
pre-engineered planed deployment.
This paper demonstrates means to detect the
fire instantly and extinguished at initial stage. An
autonomous robot equipped with advanced fire
detection technology detect fire at initial stage,
extinguished by small conceived extinguisher, sound
hooter and also send message to pre assigned number
through GSM modem. A novel approach using color
sensor TCS3200 and simple LDR (Light Dependent
Register) makes the system highly cost effective. It is
effectively a fire surveillance system that continuously
read sensor values and received data are processed by
various complex algorithms to ensure fire detection
with highly reduced false alarm and immediate action.
It also covers a large area and thus the system costs are
minimized. It is highly useful for domestics as well as
industrial environment. The total system cost is less
than $200.
It is important to note that electrical supplies
must be cut down in case of a fire incident and thus also
takes the fire detection system offline. This system being
self-sufficient and battery powered can still function. Al gan ultraviolet photodetectors grown by molecular beam epitaxy on si(111) ...
The performance of AlGaN metal-semiconductor-metal (MSM) photodetectors grown on Si(111) substrates is presented. Three key points:
1) An adequate AlN buffer layer is critical to achieve visible-blind photodetectors and electrically insulate the epitaxial film from the conductive substrate.
2) Increasing the Al content produced a transition from photoconductor to MSM photodiode behavior, as seen from responsivity, temporal response, and UV/visible contrast.
3) Contact metal affects photoconductive gain and UV/visible contrast. Pt/Ti/Au contacts showed higher contrast than Ti/Al contacts due to lower dark currents.
Potentiostatic Deposition of ZnO Nanowires: Effect of Applied Potential and Z...
In this work we report on potentiostatic deposition of Zinc oxide (ZnO) nanowires on fluorine-doped tin oxide (FTO) covered glass substrates from electroreduction of molecular oxygen. The influence of applied deposition potential, and the concentrations of zinc precursor (ZnCl2) on the properties of ZnO nanowires was investigated.SEM results revealed that ZnO nanowires electrodeposited at applied potential -0.85Vhave high density and good alignment. The diameters and densities of the electrodeposited ZnO nanowires are strongly dependent on the zinc ion concentrations and well aligned nanowires with uniform diameter can be obtained when the concentration of zinc ions is between 0.5 mM and 1 mM.
40120140505001
This document summarizes research on conducting aluminum-doped zinc oxide films deposited at low temperature using an electrochemical deposition method. ZnO films doped with various molar ratios of aluminum nitrate and zinc nitrate were deposited at 70°C using a three-electrode setup. X-ray diffraction analysis showed the successful doping of aluminum into the crystal structure of ZnO without secondary phase formation. Electrical resistivity measurements found the lowest resistivity for a composition ratio of 7:3. Optical characterization showed over 90% transmittance and band gap widening with different aluminum compositions due to incorporation into the ZnO crystal structure.
THE OPTICAL PROPERTIES OF CdSe
This document summarizes research on the optical properties of CdSe/ZnSe superlattice thin films deposited on a glass substrate using an electrodeposition technique. The films were characterized based on their absorbance, transmittance, reflectance, refractive index, extinction coefficient, dielectric constant, and band gap. The films showed low absorption in the visible and infrared regions, making them suitable for solar cell and optical applications. The high refractive index indicates potential as antireflection coatings. In conclusion, CdSe/ZnSe thin films prepared through electrodeposition exhibited optical properties useful for various device applications.
Presentation v4.1
The document describes a new thermoelectric converter called the MDSM (Metal-Dielectric-Semiconductor-Metal) converter invented by Gevork Karapet'yan. It consists of a capacitor with a thermoelectric junction that can efficiently convert thermal energy to electric energy. Research showed that applying a magnetic field can change the thermoelectric force in Indium antimonide by 7 times, potentially improving generator efficiency. The proposed MDSM converter uses an electric field rather than magnetic field to vary the thermoelectric force. It could be used to build more efficient thermoelectric coolers and generators by reducing parasitic heat flows and electric losses. Applications mentioned include powering wearable sensor nodes from body heat.
Ecs2013 paper
This document summarizes research on a palladium-functionalized single-walled carbon nanotube hydrogen gas sensor. Pd nanoparticles were deposited on aligned SWNTs using electrodeposition. The sensor was tested on a chip with 16 individually addressable sensors. Non-connected chains of small (less than 100nm) Pd nanoparticles on SWNTs exhibited high sensitivity over 60% to 2000ppm hydrogen with a detection limit of 30ppm and fast response times. The multi-channel sensor platform allowed for optimization of nanoparticle deposition and sensor performance.
2012 alamin dow-micro and nano letters-al n-nanodiamond saw
The document summarizes research on developing high-frequency surface acoustic wave nanotransducers using aluminium nitride/nanodiamond structures. The researchers fabricated surface acoustic wave devices composed of aluminium nitride deposited on nanodiamond films. These films were synthesized using microwave plasma chemical vapor deposition. The fabricated devices exhibited operating frequencies up to 5.8 GHz and acoustic velocities between 8120-9280 m/s, demonstrating their potential for applications requiring high-speed data processing and sensitive sensing at the GHz range.
Dye Sensitized Solar Cells Incorporated with Tio2 -ZnO Nanoparticles
This document summarizes a study that incorporated zinc oxide (ZnO) nanoparticles into dye-sensitized solar cells (DSSCs) to improve their photovoltaic performance. DSSCs were fabricated with TiO2 films that were coated with different numbers of ZnO layers using successive ionic layer adsorption and reaction (SILAR). The cells were tested under illumination and the best performance was achieved with two SILAR cycles of ZnO, with a power conversion efficiency of 0.0064%, over double that of cells without ZnO. More ZnO layers led to lower efficiencies due to increased recombination and reduced light absorption, showing an optimal thickness was achieved with two SILAR cycles.
Presentation (1).pdf
The document describes an experiment to study how the current flowing through a light dependent resistor (LDR) varies with changes in the power and distance of an incandescent light source. The LDR's resistance decreases when exposed to light, increasing the current. The experiment found that the current increased as the light source's power increased or its distance from the LDR decreased. Common applications of LDRs include camera light meters, photocopying machines, and automatic lighting controls.
Optical and Impedance Spectroscopy Study of ZnS Nanoparticles
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
Cd s photocondivity
This document describes experiments conducted on a CdS photo-resistor. The experiments measured (1) the photocurrent as a function of voltage at constant irradiance, finding a relationship between photocurrent and voltage, and (2) the photocurrent as a function of irradiance at constant voltages, finding that photocurrent increases non-linearly with irradiance. The document also provides background on photoconductivity and the use of CdS photo-resistors, which behave as resistors whose resistance depends on light intensity.
Abstract
1) The document discusses using electroplating on diamond substrates to manipulate nitrogen-vacancy (NV) color centers for applications in quantum optics and photonics.
2) The author aims to design planar transmission lines like spiral inductors on diamond to improve inductance and current flow, enhancing magnetic field delivery at the NV centers' resonant frequency of 2.87 GHz.
3) Finite element modeling in COMSOL Multiphysics is used to optimize the transmission line structure, which will then be fabricated using photolithography and electroplating.
Photodiode characteristics, applications and quantum efficiency
This paper deals with the Internal quantum efficiency of ITO, CdTe, ZnO/a-Si, SnS/Si, CdS /CIGS, FTO/CZTS based of material photodiode with a ITO/CdTe, ZnO/a-Si, SnS/Si, CdS /CIGS, FTO/CZTS heterojunction structure. Along with information on device characteristics, applications and properties, we provide a comparative device analysis between this type of photodiode and the slightly more efficient ITO/CdTe, ZnO/a-Si, SnS/Si, CdS /CIGS, FTO/CZTS heterojunction structure. We will get the clear concept of the relation between of generated current & load voltage. We hope, we will get a clear explanation about the effect of photodiode light intensity & wavelength on the solar efficiency. In this project we will analyze the Quantum efficiency of a photodiode.
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Simple and direct synthesis of zinc vanadate ZnV2O5 nanocrystals for its elec...
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EFFECT OF ILLUMINATION INTENSITY ON THE PERFORMANCE OF PHOTOELECTRO CHEMICAL ...
EFFECT OF ILLUMINATION INTENSITY ON THE PERFORMANCE OF PHOTOELECTRO CHEMICAL ...
TCS3200 BASED COST EFFECTIVE FIRE DETECTION MODULE FOR AUTONOMOUS SECURITY SY...
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Al gan ultraviolet photodetectors grown by molecular beam epitaxy on si(111) ...
Al gan ultraviolet photodetectors grown by molecular beam epitaxy on si(111) ...
Potentiostatic Deposition of ZnO Nanowires: Effect of Applied Potential and Z...
Potentiostatic Deposition of ZnO Nanowires: Effect of Applied Potential and Z...
2012 alamin dow-micro and nano letters-al n-nanodiamond saw
2012 alamin dow-micro and nano letters-al n-nanodiamond saw
Dye Sensitized Solar Cells Incorporated with Tio2 -ZnO Nanoparticles
Dye Sensitized Solar Cells Incorporated with Tio2 -ZnO Nanoparticles
Optical and Impedance Spectroscopy Study of ZnS Nanoparticles
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Photodiode characteristics, applications and quantum efficiency
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Cvd grown monolayered mo s2 as an effective photosensor operating at low-voltage
- 1. CVD-grown monolayered MoS2 as an effective photosensor operating at low- voltage | ISweek - Industry sourcing We report the fabrication of a photosensor based on as-grown single crystal monolayers of MoS2 synthesized by chemical vapor deposition (CVD). The measurements were performed using Au/Ti leads in a two terminal configuration on CVD-grown MoS2 on a SiO2/Si substrate. The device was operated in air at room temperature at low bias voltages ranging from −2 V to 2 V and its sensing capabilities were tested for two different excitation wavelengths (514.5 nm and 488 nm). The responsivity reached 1.1 mA W−1 when excited with a 514.5 nm laser at a bias of 1.5 V. This responsivity is one order of magnitude larger than that reported from photo devices fabricated using CVD-grown multilayered WS2. A rectifying-effect was observed for the optically excited current, which was four times larger in the direct polarization bias when compared to the reverse bias photocurrent. Such rectifying behavior can be attributed to the asymmetric electrode placement on the triangular MoS2 monocrystal. It is envisioned that these components could eventually be used as efficient and low cost photosensors based on CVD-grown transition metal dichalcogenide monolayers. ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products