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Title: Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging

In situ heating study via a simultaneous secondary electron (SE) and transmitted electron (TE) microscopy is extremely insightful because information from the surface (SE) and bulk (TE) can be readily obtained. The leached Au/Fe 2O 3 catalyst has voids on the surface of Fe 2O 3. Upon heating to 500 °C, voids shrank and disappeared, while internal Au species diffused to the surface to form new nanoparticles. Heating in vacuum reduced Fe 2O 3 to Fe 3O 4. Heating at 700 °C caused coalescence and growth of Au particles and formation of faceted Fe 3O 4 surfaces. We achieved 1.1 nm resolution in SE imaging during in situ heating.
 [1] ;  [2] ;  [3] ;  [4] ;
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Hitachi High-Technologies Canada Inc., Toronto, ON (Canada)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. McGill Univ., Montreal, QC (Canada)
  4. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nanoscale Research Letters (Online)
Additional Journal Information:
Journal Name: Nanoscale Research Letters (Online); Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 1556-276X
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; in situ TEM; STEM; SEM; catalyst; scanning transmission electron microscopy; scanning electron microscopy; phase transformation; In situ characterization