Russian Journal of Physical Chemistry B

, Volume 12, Issue 1, pp 129–134 | Cite as

Sensor Properties of Nanostructured Systems Based on Indium Oxide with Co3O4 or ZrO2 Additives

  • V. F. Gromov
  • G. N. Gerasimov
  • T. V. Belysheva
  • M. I. Ikim
  • E. Yu. Spiridonova
  • M. M. Grekhov
  • R. A. Ali-zade
  • L. I. Trakhtenberg
Electric and Magnetic Properties of Materials
  • 3 Downloads

Abstract

The effect of Co3O4 and ZrO2 additives on the sensory response of In2O3-based nanostructured composites to H2 and CO is studied. It is shown that the addition of small amounts of Co3O4 or ZrO2 to In2O3 leads to a sharp increase in the sensory response to hydrogen. The maximum sensory response of the ZrO2−In2O3 composite to 1100 ppm of hydrogen increases from 80 to 270 as the ZrO2 content changes 0 to 20 wt %. The response to CO varies only slightly. For Co3O4−In2O3 composites, the maximum response to H2 and CO increases with the Co3O4 content within 0−10 wt %. A further increase in the Co3O4 content leads to a significant decrease in the response, with composites containing ∼60 wt % Co3O4 being characterized by a very low efficiency. In the Co3O4−In2O3 system with a content of up to 60 wt % Co3O4, electronic conduction is realized, which changes to hole conduction at Co3O4 within 80−100 wt %. In the ZrO2−In2O3 system, electric current flows through In2O3 nanocrystals, i.e., n-type conduction takes place. Possible reasons for the observed effects are discussed.

Keywords

nanocomposites conductivity In2O3 Co3O4 ZrO2 sensory response reducing gases n- and p-type semiconductors 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • V. F. Gromov
    • 1
    • 2
  • G. N. Gerasimov
    • 1
    • 2
  • T. V. Belysheva
    • 1
    • 2
  • M. I. Ikim
    • 1
  • E. Yu. Spiridonova
    • 1
    • 2
  • M. M. Grekhov
    • 3
  • R. A. Ali-zade
    • 4
  • L. I. Trakhtenberg
    • 1
    • 2
  1. 1.Semenov Institute of Chemical PhysicsRussian Academy of SciencesMoscowRussia
  2. 2.Karpov Institute of Physical ChemistryMoscowRussia
  3. 3.National Research Nuclear University MEPhIMoscowRussia
  4. 4.Institute of PhysicsAzerbaijan National Academy of SciencesBakuAzerbaijan

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