Electron Microscopic Study of Heterogeneous Catalysts with 80 kV–1 MV Accelerating Voltage

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  • Yoshida Kenta
    JFCCナノ構造研究所 ヨーク大学化学専攻 名古屋大学エコトピア科学研究所
  • Arai Shigeo
    名古屋大学エコトピア科学研究所
  • Saitoh Koh
    名古屋大学エコトピア科学研究所
  • Tanaka Nobuo
    JFCCナノ構造研究所 名古屋大学エコトピア科学研究所

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  • 80 kV-1 MV電子顕微鏡を用いた不均一触媒材料の研究
  • 80kV 1 MV デンシ ケンビキョウ オ モチイタ フキンイツ ショクバイ ザイリョウ ノ ケンキュウ

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Abstract

<p>Platinum supported on titanium dioxide (Pt/TiO2) exhibits remarkably high activity towards the decomposition reaction of organic molecules. Recently the size of Pt clusters has been reduced to less than 1nm. In contrast, the size of TiO2 support particles has been kept at sub-micron sizes to ensure stability at high temperature. The surface has also been modified to form a heterogeneous nanostructure. Although these complex nanocatalysts can be visualized by transmission electron microscopy, switching between several accelerating voltages improves the reproducibility and reliability of the results. Here we report a progressive electron microscopy study of such heterogeneous catalysts using accelerating voltages of 80kV to 1MV. Switching voltages is also essential for estimating the beam effect when performing environmental transmission electron microscopy (ETEM). We present EM images of Pt/TiO2 photocatalysts by advanced ETEM taken over this range of accelerating voltages. In the 80keV TEM image, selective lattice imaging of the Pt nanoparticle was achieved. In addition, greater contrast was obtained in comparison with a conventional 200keV image. On the other hand, a 300keV accelerating voltage provided clearer lattice imaging of the TiO2 supporting particles. In the 1MeV TEM image, surface steps and defect structures of TiO2 were successfully visualized.</p>

Journal

  • KENBIKYO

    KENBIKYO 46 (1), 11-15, 2011-03-30

    The Japanese Society of Microscopy

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