scholarly journals GS9.1 - A Novel FET-type Hydrogen Gas Sensor with Pd-decorated Single-Walled Carbon Nanotubes by Electroplating Method

2018 ◽  
Author(s):  
S. Hong ◽  
J. Shin ◽  
Y. Hong ◽  
M. Wu ◽  
Y. Jeong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Single Walled Carbon Nanotubes ◽  
Hydrogen Gas ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Effect of Operating Temperature on Characteristics of Single-Walled Carbon Nanotubes Gas Sensor

2005 ◽  
Vol 486-487 ◽  
pp. 485-488 ◽  
Author(s):  
Hong Quang Nguyen ◽  
Mai Van Trinh ◽  
Jeung Soo Huh
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Gas Adsorption ◽  
Operating Temperature ◽  
High Sensitivity ◽  
Single Walled Carbon Nanotubes ◽  
Fast Response ◽  
Carrier Gas ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The effect of operating temperature on characteristics of single-walled carbon nanotubes (SWNT) based gas sensor was investigated. SWNT-based sensor was fabricated from SWNT powder (Iljin Nanotech, Korea) by screen-printing method. SWNT powder (30 mg, AP grade) was dispersed into 0.78 gram a-terpineol (Aldrich) by ultrasonic vibration for 1 hour then stirred manually for 1 hour to increase adhesion. From this condensed solution, a thick film of SWNT was printed onto alumina substrates. The film then was sintered at 300oC for 2 hours to remove residual impurities. Upon exposure to some gases such as nitrogen, ammonia or nitric oxide, resistance of the sensor dramatically changes due to gas adsorption. In our experiments, SWNT-based sensor was employed to detect NH3 gas in N2 ambience. After saturated of N2, the sensor exposes to NH3 with various concentrations (from 5 ppm to 100 ppm, diluted by N2 as carrier gas). This sensor exhibits a fast response, high sensitivity but slow recovery at room temperature. By heating at high temperature and increasing the flow-rate of carrier gas, NH3 gas desorbs easily and recovery of the sensor improved. The heating also influenced the characteristics of sensors such as response and reproducibility. Other special changes in electric property of SWNT-based sensor caused by heating are also discussed.

Flexible NO 2 gas sensor based on single-walled carbon nanotubes on polytetrafluoroethylene substrates

2018 ◽  
Vol 3 (3) ◽  
pp. 035001 ◽  
Author(s):  
Pankaj B Agarwal ◽  
Bayazeed Alam ◽  
Daya Shankar Sharma ◽  
Sumit Sharma ◽  
Soumen Mandal ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Poly(m-aminobenzene sulfonic acid) functionalized single-walled carbon nanotubes based gas sensor

2007 ◽  
Vol 18 (16) ◽  
pp. 165504 ◽  
Author(s):  
Ting Zhang ◽  
Syed Mubeen ◽  
Elena Bekyarova ◽  
Bong Young Yoo ◽  
Robert C Haddon ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Sulfonic Acid ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Development of an ozone gas sensor using single-walled carbon nanotubes

2009 ◽  
Vol 140 (2) ◽  
pp. 407-411 ◽  
Author(s):  
Youngmin Park ◽  
Ki-Young Dong ◽  
Jinwoo Lee ◽  
Jinnil Choi ◽  
Gwi-Nam Bae ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Production of high quality single-walled carbon nanotubes in a nano-agglomerated fluidized bed reactor

2003 ◽  
Vol 785 ◽  
Author(s):  
Qixiang Wang ◽  
Guoqing Ning ◽  
Fei Wei ◽  
Guohua Luo
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Fluidized Bed ◽  
Single Walled Carbon Nanotubes ◽  
Fluidized Bed Reactor ◽  
Hydrogen Gas ◽  
Synthesis Methods ◽  
High Quality ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

ABSTRACTSSingle-walled carbon nanotubes (SWNTs) have attracted much attention due to their unique structural, mechanical, chemical, and electrical properties. Catalytic chemical vapor deposition (CCVD) through decomposition of hydrocarbons is one of the most challenging synthesis methods to produce SWNTs in large scale. In this paper, high quality SWNTs prepared in a nano-agglomerated fluidized bed reactor (NAFBR) was reported. The reactor is a vertical quartz tube with the inner diameter of about 50 mm. Catalysts nanoparticles used for the production of SWNTs were prepared with Fe metal nanoparticles carried on the surface of MgO. About 150g catalysts powders were loaded on the gas distribution grid. The reaction temperature was controlled at not less than 1123 K. The carrier gas of argon was used to maintain turbulent fluidization of the catalysts powders in FBR. The hydrogen gas was used to reduce the catalysts and to synergize the growth of SWNTs with methane. The powder products were spherical agglomerates of SWNTs bundles tangling with the catalysts particles. By optimizing the process parameters of CCVD, the products of SWNTs with the diameter about 0.9 ∼ 1.8 nm were prepared, without any multi-walled carbon nanotubes (MWNTs) or amorphous carbon. The microstructure of SWNTs products were characterized by the methods of high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), Raman spectra, etc. The NAFBR is a commercially viable (effective and continuous production at a low cost) process for the production of SWNTs.

Highly Stable and Sensitive Gas Sensor Based on Single-Walled Carbon Nanotubes Protected by Metal-Oxide Coating Layer

2009 ◽  
Vol 2 (9) ◽  
pp. 095008 ◽  
Author(s):  
Winadda Wongwiriyapan ◽  
Satoshi Inoue ◽  
Yusuke Okabayashi ◽  
Tatsuya Ito ◽  
Ryotaro Shimazaki ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Metal Oxide ◽  
Gas Sensor ◽  
Coating Layer ◽  
Oxide Coating ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Metal Oxide Coating
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