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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/Fe2O3 catalyst has voids on the surface of Fe2O3. 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 Fe2O3 to Fe3O4. Heating at 700 °C caused coalescence and growth of Au particles and formation of faceted Fe3O4 surfaces. We achieved 1.1 nm resolution in SE imaging during in situ heating.
Authors:
 [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:
1235811
Grant/Contract Number:
AC05-00OR22725
Type:
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
Publisher:
Springer
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE in situ TEM; STEM; SEM; catalyst; scanning transmission electron microscopy; scanning electron microscopy; catalyst; phase transformation; In situ characterization