Paper Title:
Effect of Operating Temperature on Characteristics of Single-Walled Carbon Nanotubes Gas Sensor
  Abstract

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.

  Info
Periodical
Materials Science Forum (Volumes 486-487)
Edited by
Hyung Sun Kim, Sang-Yeop Park, Bo Young Hur and Soo Wohn Lee
Pages
485-488
DOI
10.4028/www.scientific.net/MSF.486-487.485
Citation
H. Q. Nguyen, M. Van Trinh, J. S. Huh, "Effect of Operating Temperature on Characteristics of Single-Walled Carbon Nanotubes Gas Sensor", Materials Science Forum, Vols. 486-487, pp. 485-488, 2005
Online since
June 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Kyong Soo Lee, Jea Hong Kwon, Seung Il Moon, Woo Sung Cho, Yun Hi Lee, Byeong Kwon Ju
Abstract:In this paper, We presents experimental results that demonstrate the pH sensing capability of MW-CNTs. High-density, well-aligned carbon...
1367
Authors: Yun He Liang, Yong Ping Pu, Hong Yan Miao
Abstract:PTCR ceramic samples of two systems, Bi4Ti3-xNbxO12+x/2(BTNO, 0≤x≤0.01) and Bi4Ti3O12 + (1-z)BaTi1-xNbxO3+x/2+2.0mol%TiO2 (BTO+(1-z)BTNO,...
459
Authors: Hua Bing Li, Zhou Hua Jiang, Zhen Li, Zu Rui Zhang
Abstract:The effects of pH value and chloride ions concentration of the solution on pitting susceptibility and semiconducting properties of passive...
993
Authors: Jung Chuan Fan, Huang Huei Sung, Chun Rong Lin
Abstract:The semiconducting property of carbon nanotubes have been investigated by the luminescence measurement. The morphology of carbon nanotubes...
116
Authors: Hideaki Watanabe, Hiroki Komure, Michihiko Nakano, Junya Suehiro
Chapter 5: Related Topics
Abstract:Single-walled carbon nanotubes (SWCNTs) gas sensor has attracted a great deal of attention because of their remarkable properties. The sensor...
915