Microstructural Control of the TiO<SUB>2</SUB>-SnO<SUB>2</SUB> Binary System and Synthesis of SnO<SUB>2</SUB> Nanowhiskers by Microwave Irradiation

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  • Aoyagi Takuya
    Department of Applied Chemistry, Graduate School of Engineering, Tohoku University
  • Hayashi Yamato
    Department of Applied Chemistry, Graduate School of Engineering, Tohoku University
  • Takizawa Hirotsugu
    Department of Applied Chemistry, Graduate School of Engineering, Tohoku University

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  • Microstructural control of the TiO2-SnO2 binary system and synthesis of SnO2 nanowhiskers by micro wave irradiation

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Abstract

SnO2 single crystals (columnar crystals and silver grass-like nanowhiskers) were synthesized by selective microwave heating of a TiO2-SnO2 mixture. The shape of the as-grown SnO2 crystals is strongly dependent on the atmosphere during microwave irradiation. This is due to the difference in growth mechanisms, as revealed by in-situ surface observation under microwave irradiation, in addition to scanning and transmission electron microscopy observations of irradiated specimens. In a N2 atmosphere, silver grass-like SnO2 nanowhiskers were obtained. On the other hand, columnar SnO2 crystals were obtained in air or an O2 atmosphere. Photoluminescence and absorption spectra of the as-grown SnO2 crystals were examined. Based on the analysis of a TiO2-SnO2 pellet, it was found that the bottom was selectively heated, and SnO2 sublimated by microwave irradiation. A density gradient texture of the sample pellet was formed.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 49 (4), 879-884, 2008

    The Japan Institute of Metals and Materials

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