Micromachined sol-gel carbon nanotube/SnO2 nanocomposite hydrogen sensor

    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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