Inverse-catalyst-effect observed for nanocrystalline-doped tin oxide sensor at lower operating temperatures

    Authors

    S. Shukla; L. Ludwig; C. Parrish;S. Seal

    Comments

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    Abbreviated Journal Title

    Sens. Actuator B-Chem.

    Keywords

    hydrogen; indium oxide; inverse-catalyst-effect; lower operating; temperatures; sensor; sol-gel; thin films; tin oxide; GAS SENSOR; THIN-FILMS; PERFORMANCES; THICKNESS; H-2; CO; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation

    Abstract

    Nanocrystalline In2O3-doped SnO2 thin film sensor is synthesized via sol-gel dip-coating technique. This nanocrystalline thin film is successfully utilized to sense hydrogen (H-2) gas with the concentration as low as 50 ppm at lower operating temperatures (25-100 degreesC). For short test-duration (30 min), the H-2 sensitivity of the Pt-sputtered sensor is observed to be higher than that of the non-Pt-sputtered film. An "inverse-catalyst-effect" on the H-2) gas sensitivity is, however, newly observed when the test-duration is increased to 24 h. The presence of H2O molecules, which remain adsorbed and get accumulated on the sensor surface, during the long test-duration, are primarily attributed to the reduced H-2 gas sensitivity of the Pt-sputtered sensors, relative to that of non-Pt- sputtered sensors, at lower operating temperatures (25-100 degreesC). (C) 2004 Elsevier B.V. All rights reserved.

    Journal Title

    Sensors and Actuators B-Chemical

    Volume

    104

    Issue/Number

    2

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    223

    Last Page

    231

    WOS Identifier

    WOS:000225384200008

    ISSN

    0925-4005

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