scholarly journals INVESTIGATION OF SENSITIVITY AND SELECTIVITY OF MWCNT–BASED SENSOR FOR AMMONIAC GAS DETECTION AT ROOM TEMPERATURE

2012 ◽  
Vol 15 (2) ◽  
pp. 62-69
Author(s):  
Lich Quang Nguyen ◽  
Tu Cong Nguyen ◽  
Anh Tuan Ly ◽  
Thanh Phuc Tran ◽  
Pho Quoc Phan ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Gas Detection ◽  
Cvd Method ◽  
Sensor Device ◽  
Pt Electrodes ◽  
Multi Walled Carbon Nanotube ◽  
Sensitivity And Selectivity

Gas sensors based on multi-walled carbon nanotube (MWCNT) for detecting gaseous molecules of ammoniac (NH3) were developed and investigated. MWCNT film was grown directly by chemical vapor deposition (CVD) method on Pt electrodes to fabricate sensor device. The CNT based – gas sensor is shown sensitively and selectively to NH3 gas at room temperature.

scholarly journals Influence of Ag nanoparticles on the physical properties of multilayers of graphene

DYNA ◽  
2019 ◽  
Vol 86 (211) ◽  
pp. 49-53
Author(s):  
Jose Edgar Alfonso ◽  
John Jairo Olaya
Keyword(s):  
Magnetic Properties ◽  
Seebeck Coefficient ◽  
Physical Properties ◽  
Vapor Deposition ◽  
Ag Nanoparticles ◽  
Room Temperature ◽  
Deposition Time ◽  
Chemical Vapor ◽  
Initial Value ◽  
Cvd Method

Graphene has attracted considerable interest due its exceptional physical properties. This article describes the thermoelectric and magnetic properties such as the Seebeck coefficient and the magnetoresistance, at room temperature, of multilayers of graphene fabricated through the chemical vapor deposition (CVD) method and coated with Ag nanoparticles (NPs). According to the results, the Seebeck coefficient increased from -30 to -5 μV/K as a function of deposition time of Ag NPsand magnetoresistance increase their initial value as a function of sheet resistance up to 16.6%.

H2 Gas Sensor Based on Pd-Loaded Carbon Nanotube Film

2020 ◽  
Vol 20 (7) ◽  
pp. 4470-4473
Author(s):  
Maeum Han ◽  
Jae Keon Kim ◽  
Junyeop Lee ◽  
Hee Kyung An ◽  
Jong Pil Yun ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Gas Sensors ◽  
Room Temperature ◽  
Pd Nanoparticles ◽  
Gas Detection ◽  
Structural Flexibility ◽  
Bending Tests ◽  
Multi Walled Carbon Nanotube ◽  
Reliable Detection ◽  
Detection Characteristics

Palladium-coated multi-walled carbon nanotube (Pd-MWCNT) nanocomposites have been experimentally proven to show highly improved hydrogen (H2) gas detection characteristics at room temperature when compared with single MWCNTs. In this context, we develop an efficient and convenient method for forming nanocomposites by coating Pd nanoparticles on an MWCNT film. Furthermore, we test the applicability of the nanocomposites as sensing materials in detecting H2 gas at room temperature in a reliable and sensitive manner in contrast with ordinary metal-oxidebased gas sensors that operate at high temperatures. We first study the detection efficacy of the Pd-MWCNT film relative to pure MWCNT film. Subsequently, we investigate the Pd-MWCNT sensor’s sensitivity over time for different gas concentrations, the sensor response time, and sensor reproducibility and reliability under various conditions including bending tests. Our sensor exhibits stable reliable detection characteristics and excellent structural flexibility.

Growth of Carbon Nanotubes by Evaporating Ethanol as Carbon Source

2007 ◽  
Vol 124-126 ◽  
pp. 1237-1240
Author(s):  
Nam Jo Jeong ◽  
Yong Seog Seo ◽  
Hee Yeon Kim ◽  
Jung Hoon Lee
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Source ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Average Diameter ◽  
Radial Breathing Mode ◽  
Tem Analysis ◽  
Cvd Method ◽  
Synthesis Of Carbon Nanotubes

We report the synthesis of carbon nanotubes (CNTs) from ethanol by a chemical vapor deposition (CVD) method. Ethanol used as carbon source is atomized by an ultrasonic evaporator at room temperature, and is injected into a CVD furnace through a nozzle installed inside the furnace. The SEM and TEM analysis shows that the product contained CNTs as major constituents with some impurities. The radial breathing mode (RBM) of Raman spectrum reveals that the SWNTs are included in the product. The average diameter of the MWNTs is about 30nm and that of the SWNTs is less than 2nm.

High Band Gap Nanocrystalline Tungsten Carbide (nc-WC) Thin Films Grown by Hot Wire Chemical Vapor Deposition (HW-CVD) Method

2018 ◽  
Vol 10 (3) ◽  
pp. 03001-1-03001-6 ◽  
Author(s):  
Bharat Gabhale ◽  
◽  
Ashok Jadhawar ◽  
Ajinkya Bhorde ◽  
Shruthi Nair ◽  
...  
Keyword(s):  
Thin Films ◽  
Chemical Vapor Deposition ◽  
Tungsten Carbide ◽  
Band Gap ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Hot Wire ◽  
Cvd Method ◽  
High Band

scholarly journals Blackbody-sensitive room-temperature infrared photodetectors based on low-dimensional tellurium grown by chemical vapor deposition

2021 ◽  
Vol 7 (16) ◽  
pp. eabf7358
Author(s):  
Meng Peng ◽  
Runzhang Xie ◽  
Zhen Wang ◽  
Peng Wang ◽  
Fang Wang ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Spectral Response ◽  
Chemical Vapor ◽  
Hole Mobility ◽  
Infrared Detection ◽  
Infrared Photodetectors ◽  
Bandgap Semiconductors ◽  
Low Dimensional

Blackbody-sensitive room-temperature infrared detection is a notable development direction for future low-dimensional infrared photodetectors. However, because of the limitations of responsivity and spectral response range for low-dimensional narrow bandgap semiconductors, few low-dimensional infrared photodetectors exhibit blackbody sensitivity. Here, highly crystalline tellurium (Te) nanowires and two-dimensional nanosheets were synthesized by using chemical vapor deposition. The low-dimensional Te shows high hole mobility and broadband detection. The blackbody-sensitive infrared detection of Te devices was demonstrated. A high responsivity of 6650 A W−1 (at 1550-nm laser) and the blackbody responsivity of 5.19 A W−1 were achieved. High-resolution imaging based on Te photodetectors was successfully obtained. All the results suggest that the chemical vapor deposition–grown low-dimensional Te is one of the competitive candidates for sensitive focal-plane-array infrared photodetectors at room temperature.

Room temperature observation of the correlation between atomic and electronic structure of graphene on Cu(110)

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 98001-98009 ◽  
Author(s):  
Thais Chagas ◽  
Thiago H. R. Cunha ◽  
Matheus J. S. Matos ◽  
Diogo D. dos Reis ◽  
Karolline A. S. Araujo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Chemical Vapor Deposition ◽  
Scanning Tunneling Microscopy ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Temperature Observation ◽  
Atomic And Electronic Structure

We have used atomically-resolved scanning tunneling microscopy and spectroscopy to study the interplay between the atomic and electronic structure of graphene formed on copper via chemical vapor deposition.

Molecule-Based Magnets—An Overview

MRS Bulletin ◽  
2000 ◽  
Vol 25 (11) ◽  
pp. 21-30 ◽  
Author(s):  
Joel S. Miller ◽  
Arthur J. Epstein
Keyword(s):  
Low Temperature ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Magnetic Ordering ◽  
Low Density ◽  
Materials Properties ◽  
The Common ◽  
New Processing ◽  
Very High

Molecule-based magnets are a broad, emerging class of magnetic materials that expand the materials properties typically associated with magnets to include low density, transparency, electrical insulation, and low-temperature fabrication, as well as combine magnetic ordering with other properties such as photoresponsiveness. Essentially all of the common magnetic phenomena associated with conventional transition-metal and rare-earth-based magnets can be found in molecule-based magnets. Although discovered less than two decades ago, magnets with ordering temperatures exceeding room temperature, very high (∼27.0 kOe or 2.16 MA/m) and very low (several Oe or less) coercivities, and substantial remanent and saturation magnetizations have been achieved. In addition, exotic phenomena including photoresponsiveness have been reported. The advent of molecule-based magnets offers new processing opportunities. For example, thin-film magnets can be prepared by means of low-temperature chemical vapor deposition and electrodeposition methods.

Properties and Production Mechanism of Low-Temperature Deposited CAT-CVD Poly-Silicon films

1992 ◽  
Vol 283 ◽  
Author(s):  
Hideki Matsumura ◽  
Yoichi Hosoda ◽  
Seijiro Furukawa
Keyword(s):  
Chemical Vapor Deposition ◽  
Low Temperature ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Gas Pressure ◽  
Silicon Films ◽  
Production Mechanism ◽  
Cvd Method ◽  
Poly Silicon ◽  
Deposition Conditions

ABSTRACTPoly-silicon films are obtained at temperatures as low as 400 °C by the catalytic chemical vapor deposition (cat-CVD) method, in which deposition gases are decomposed by the catalytic or pyrolytic reactions with a heated catalyzer near substrates. It is found that there are roughly two modes of deposition conditions such as low gas pressure mode and high gas pressure mode for obtaining poly-silicon films, and also that the Hall mobility of the cat-CVD poly-silicon films of low gas pressure mode sometimes exceeds over 100 cm2/Vs.

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