Gas sensing characteristics of multi-wall carbon nanotubes

被引：466

作者：

Varghese, OK

Kichambre, PD

Gong, D

Ong, KG

Dickey, EC

Grimes, CA ^{[1
]}

机构：

[1] Penn State Univ, Dept Elect Engn, Mat Res Lab 204, University Pk, PA 16802 USA

[2] Penn State Univ, Mat Res Inst, Mat Res Lab 204, University Pk, PA 16802 USA

[3] Univ Kentucky, Dept Elect & Comp Engn, Lexington, KY 40506 USA

[4] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2001年 / 81卷 / 01期

基金：

美国国家科学基金会;

关键词：

carbon nanotubes; gas sensor; impedance;

D O I：

10.1016/S0925-4005(01)00923-6

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Impedance spectroscopy was used to study the gas sensing behavior of both capacitance and resistance based sensors employing multi-wall carbon nanotubes (MWNTs) as the active sensing element. Studies revealed the chemisorption of reducing gases upon the surface of the MWNTs. Increasing sensor impedance was observed with increasing humidity or partial pressures of ammonia, carbon monoxide, and carbon dioxide. The impedance changes are attributed to p-type conductivity in semiconducting MWNTs, and the formation of Schottky barriers between the metallic and semiconducting nanotubes. Reversible behavior is demonstrated for the MWNT sensors in response to humidity, carbon monoxide and carbon dioxide. The MWNT sensors strongly respond to ammonia behaving as dosimeters. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：32 / 41

页数：10

共 58 条

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