Hydrogen selective gas sensor in humid environment based on polymer coated nanostructured-doped tin oxide

    Authors

    A. Kumar; P. Zhang; A. Vincent; R. McCormack; R. Kalyanaraman; H. J. Cho;S. Seal

    Comments

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    Abbreviated Journal Title

    Sens. Actuator B-Chem.

    Keywords

    Hydrogen gas sensor; MEMS device; Hydrophobic polymer coatings; Humid; sensing environment; Tin oxide; THIN-FILM; THEORETICAL-MODEL; SENSITIVITY; MEMBRANES; WATER; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation

    Abstract

    Nanocrystalline indium oxide-doped tin oxide thin film sensors have been synthesized using sol-gel dip-coating technique. The sensors were spin-coated with three different types of polymer namely polymethyl methacrylate (PMMA), poly-perfluorobutenyl vinyl ether (Cytop), fluoropolymer (Fluoropel). The room temperature sensor characteristics (response time, electrical response and recovery time) of the three sensors with different polymer coating were compared at hydrogen concentrations of 600, 1500, 6000 and 15,000 ppm and at two different humidity levels of 14% and 65%. It was found that the polymer coating preserves the selective sensing property of indium oxide-doped tin oxide even at high humidity. The response kinetics of the sensors with different coatings has been compared. (C) 2011 Elsevier B.V. All rights reserved.

    Journal Title

    Sensors and Actuators B-Chemical

    Volume

    155

    Issue/Number

    2

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    884

    Last Page

    892

    WOS Identifier

    WOS:000291774100064

    ISSN

    0925-4005

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