Conductivity and sensing properties of In2O3 + ZnO mixed nanostructured films: Effect of composition and temperature

    Authors

    L. I. Trakhtenberg; G. N. Gerasimov; V. F. Gromov; T. V. Belysheva;O. J. Ilegbusi

    Comments

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    Abbreviated Journal Title

    Sens. Actuator B-Chem.

    Keywords

    Semiconductor; Mixed metal-oxide; Sensor response; Conductivity; Nanocomposite film; SEMICONDUCTOR GAS SENSORS; INDIUM OXIDE; THIN-FILMS; ZNO; CO; H-2; MODEL; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation

    Abstract

    The conductivity and conductometric sensor response of mixed In2O3 + ZnO nanocrystalline composite systems to H-2 and CO in air ambience are investigated for varying oxide compositions. The maximum sensor response to H-2 and CO is obtained for composite films containing 15 wt% and 80 wt% In2O3. This sensor response is also much higher than the values obtained for the individual oxides. The sensory mechanism is proposed to be largely determined by the dependence of the conduction paths on the film composition. The major factors determining the conductivity and sensor response of the In2O3 + ZnO composite are: (i) the modification of the electronic structure of the crystals (mainly, In2O3) during the synthesis of the composite, (ii) the electron transfer from In2O3 to ZnO, and (iii) the catalytic activity of ZnO in the dissociation reactions of O-2 and H-2. (C) 2013 Elsevier B.V. All rights reserved.

    Journal Title

    Sensors and Actuators B-Chemical

    Volume

    187

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    514

    Last Page

    521

    WOS Identifier

    WOS:000324298300076

    ISSN

    0925-4005

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