Title

Micromachined sol-gel carbon nanotube/SnO2 nanocomposite hydrogen sensor

Authors

Authors

J. W. Gong; J. R. Sun;Q. F. Chen

Comments

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Abbreviated Journal Title

Sens. Actuator B-Chem.

Keywords

SWCNT/SnO2 nanocomposite; sol-gel; hydrogen sensor; micromachining; GAS SENSORS; FILMS; NOSE; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation

Abstract

A novel micromachined single wall carbon nanotube (SWCNT) reinforced nanocrystalline tin dioxide gas sensor has been developed. The presence of SWCNT in SnO2 matrix was realized by a spin-on sol-gel process. The SWCNT/SnO2 sensor's sensitivity for hydrogen detection has greatly increased by a factor of three, in comparison to that of pure SnO2 sensor. The novel sensor also lowers the working temperature, response time and recovery time. The greatly improved performances are mainly attributed to the effective gas accessing nano passes through SWCNT plus the smaller distance between adjacent gas accessing boundaries formed by the distribution of tiny SWCNTs. Therefore, both the spatial requirement (D <= 2L, D is the distance between adjacent gas accessing boundaries and L is the space charge layer thickness) and surficial requirement (adequate gas activation area) are met and the maximum inherent sensitivity of SnO2 is achieved. (c) 2007 Elsevier B.V. All rights reserved.

Journal Title

Sensors and Actuators B-Chemical

Volume

130

Issue/Number

2

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

829

Last Page

835

WOS Identifier

WOS:000255107700040

ISSN

0925-4005

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