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Characterization of tin oxide films prepared as gas sensors by conversion electron Mössbauer spectrometry

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Abstract

Mn and Ni oxides incorporated tin oxide films, prepared by a spray pyrolysis technique and treated in hydrogen atmospheres, were characterized by conversion electron Mössbauer spectrometry and electron spin resonance to study the gas-sensing mechanism of tin oxides by the addition of metal oxides. Although the chemical state of Sn in undoped tin oxide film did not change after treatment with 5% H2 at 400°C, the reduced Sn species was detected in the tin oxide films doped with Pd. In Sn-Mn oxide films with the addition of Pd, the chemical state of Sn did not change, but the state of Mn changed on exposure to H2. In Sn-Ni oxide films with and without Pd, the chemical states of Sn and Ni were strongly affected by H2. A mechanism of hydrogen spillover effect on the tin oxide films is discussed.

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Authors and Affiliations

  1. Faculty of Engineering, The University of Tokyo Hongo, 7-3-1, Bunkyo-ku, 113, Tokyo

    S. S. Sharma, K. Nomura & Y. Ujihira

Authors
  1. S. S. Sharma
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  2. K. Nomura
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  3. Y. Ujihira
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Sharma, S.S., Nomura, K. & Ujihira, Y. Characterization of tin oxide films prepared as gas sensors by conversion electron Mössbauer spectrometry. J Mater Sci 26, 4104–4109 (1991). https://doi.org/10.1007/BF02402953

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  • DOI: https://doi.org/10.1007/BF02402953

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