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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Environmental transmission electron microscopy for catalyst materials using a spherical aberration corrector.

Seiji Takeda1, Yasufumi Kuwauchi1, Hideto Yoshida1

  • 1Nanoscience and Nanotechnology Center, Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.

Ultramicroscopy
|December 16, 2014
PubMed
Summary

Environmental transmission electron microscopy (ETEM) with a Cs-corrector achieves atomic resolution for in-situ catalyst studies. This technique reveals atomic-scale structural information and reaction mechanisms in catalytic materials.

Keywords:
CatalystCs correctorEnvironmental transmission electron microscopyGoldNanoparticlePlatinumQuantification

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Area of Science:

  • Materials Science
  • Surface Science
  • Analytical Chemistry

Background:

  • Advancements in environmental transmission electron microscopy (ETEM) technology, including spherical aberration (Cs) correction, enable atomic resolution imaging.
  • Significant progress in environmental control within ETEM has been made over the last decade.
  • Established quantification methodologies allow for deriving experimental data from atomic-scale ETEM observations of catalysts.

Purpose of the Study:

  • To review the evolution and capabilities of Cs-corrected ETEM for atomic-scale imaging.
  • To highlight the necessary conditions and technical aspects for achieving atomic resolution in ETEM.
  • To showcase recent applications of Cs-corrected ETEM in understanding catalyst materials.

Main Methods:

  • Utilizing a Cs-corrected environmental transmission electron microscope (ETEM) for high-spatial-resolution imaging.
  • Employing statistical and numerical image analysis for ETEM data.
  • In-situ environmental control during electron microscopy observations.

Main Results:

  • Demonstration of high spatial resolution in Cs-corrected ETEM under various conditions.
  • Deduction of reaction and adsorption sites for gold nanoparticulate catalysts.
  • Elucidation of structure-activity correlations and surface atomic processes for Pt nanoparticulate catalysts.

Conclusions:

  • Cs-corrected ETEM is a powerful tool for atomic-scale characterization of catalysts.
  • The technique provides insights into reaction mechanisms and surface dynamics.
  • Future development should address reproducibility, environmental control, irradiation effects, and safety.