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N2 Detection by the Carbon nanotubes Mat and Bundle

Published online by Cambridge University Press:  01 February 2011

Chien-Sheng Huang ,
Bohr-Ran Huang ,
Yung-Huang Jang ,
Meng-Shian Tsai ,
Jiun-You Ya  and
Jia-An Jian
Chien-Sheng Huang
Affiliation:
huangchs@yuntech.edu.tw, National Yunlin University of Science and Technology, Taiwan, 64002, 123 University Road, Section 3,, Douliou, Yunlin, 64002, Taiwan
Bohr-Ran Huang
Affiliation:
huangbr@yuntech.edu.tw, Taiwan
Yung-Huang Jang
Affiliation:
g9213725@yuntech.edu.tw
Meng-Shian Tsai
Affiliation:
g9313763@yuntech.edu.tw
Jiun-You Ya
Affiliation:
g9113101@yuntech.edu.tw
Jia-An Jian
Affiliation:
g9113005@yuntech.edu.tw
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Abstract

Carbon nanotubes (CNTs) were synthesized by thermal chemical vapor deposition (thermal CVD) on n-type Si (100) at 700 ° under C2H2 gas flow ratio of 30 sccm. Fe catalysts were pre-deposited by RF sputtering system with RF power 150 W. Two kinds of as-grown CNTs were used to detect N2: the vertically oriented carbon nanotubes (CNTs) mat and horizontally oriented CNTs bundle. Two-terminal electrical measurements were performed at room temperature of 25 °. The electrical resistance of CNTs mat or bundle was found to increase when exposed to N2 environment, and to return back after the N2 pumping, respectively. However, the CNTs bundle had better sensitivity and possessed faster response and recovery time. This could be ascribed to that the CNTs bundle, with more effective grooves on the surface, provided more lower binding-force sites to absorb N2 molecules than the CNTs mat dose, which prominently had interstitial sites.

Keywords

catalyticscanning electron microscopy (SEM)transmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 900: Symposium O – Nanoparticles and Nanostructures in Sensors and Catalysis , 2005 , 0900-O09-37
Copyright
Copyright © Materials Research Society 2006

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