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1 results

  • In situ Scanning Transmission Electron Microscopy with Atomic Resolution under Atmospheric Pressure

  • Sheng Dai, Shuyi Zhang, George W. Graham, Xiaoqing Pan
  • Journal:
    Microscopy Today / Volume 27 / Issue 3 / May 2019
    Published online by Cambridge University Press:
    03 May 2019, pp. 16-21
    Print publication:
    May 2019
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  • Significant developments in micro-electrical-mechanical systems (MEMS)-based devices have led to the commercialization of windowed gas cells that now enable atomic-resolution scanning transmission electron microscopy (STEM) observation of phenomena occurring during gas-solid interactions at atmospheric pressure. An in situ atmospheric STEM study provides information that is beneficial to correlating the structure-properties relationship of catalytic nanomaterials, particularly under realistic gaseous reaction conditions. In this article, we illustrate the advantages of this tool as applied to our study of two important systems: (1) the CO-induced Pt nanoparticle surface reconstruction at saturation coverage and (2) the ordering and Pt surface enrichment in supported Pt3Co nanoparticles.