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

By coupling techniques of simultaneous secondary (SE) and transmitted electron (TE) imaging at high resolution in a modern scanning transmission electron microscope (STEM), with the ability to heat specimens using a highly stable MEMS-based heating platform, we obtained synergistic information to cl...

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Autores principales: Howe, Jane Y, Allard, Lawrence F, Bigelow, Wilbur C, Demers, Hendrix, Overbury, Steven H
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4236855/
https://www.ncbi.nlm.nih.gov/pubmed/25419195
http://dx.doi.org/10.1186/1556-276X-9-614
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author Howe, Jane Y
Allard, Lawrence F
Bigelow, Wilbur C
Demers, Hendrix
Overbury, Steven H
author_facet Howe, Jane Y
Allard, Lawrence F
Bigelow, Wilbur C
Demers, Hendrix
Overbury, Steven H
author_sort Howe, Jane Y
collection PubMed
description By coupling techniques of simultaneous secondary (SE) and transmitted electron (TE) imaging at high resolution in a modern scanning transmission electron microscope (STEM), with the ability to heat specimens using a highly stable MEMS-based heating platform, we obtained synergistic information to clarify the behavior of catalysts during in situ thermal treatments. Au/iron oxide catalyst 'leached' to remove surface Au was heated to temperatures as high as 700°C. The Fe(2)O(3) support particle structure tended to reduce to Fe(3)O(4) and formed surface terraces; the formation, coalescence, and mobility of 1- to 2-nm particles on the terraces were characterized in SE, STEM-ADF, and TEM-BF modes. If combined with simultaneous nanoprobe spectroscopy, this approach will open the door to a new way of studying the kinetics of nano-scaled phenomena.
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spelling pubmed-42368552014-11-21 Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging Howe, Jane Y Allard, Lawrence F Bigelow, Wilbur C Demers, Hendrix Overbury, Steven H Nanoscale Res Lett Nano Express By coupling techniques of simultaneous secondary (SE) and transmitted electron (TE) imaging at high resolution in a modern scanning transmission electron microscope (STEM), with the ability to heat specimens using a highly stable MEMS-based heating platform, we obtained synergistic information to clarify the behavior of catalysts during in situ thermal treatments. Au/iron oxide catalyst 'leached' to remove surface Au was heated to temperatures as high as 700°C. The Fe(2)O(3) support particle structure tended to reduce to Fe(3)O(4) and formed surface terraces; the formation, coalescence, and mobility of 1- to 2-nm particles on the terraces were characterized in SE, STEM-ADF, and TEM-BF modes. If combined with simultaneous nanoprobe spectroscopy, this approach will open the door to a new way of studying the kinetics of nano-scaled phenomena. Springer 2014-11-14 /pmc/articles/PMC4236855/ /pubmed/25419195 http://dx.doi.org/10.1186/1556-276X-9-614 Text en Copyright © 2014 Howe et al.; licensee Springer. http://creativecommons.org/licenses/by/4.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
spellingShingle Nano Express
Howe, Jane Y
Allard, Lawrence F
Bigelow, Wilbur C
Demers, Hendrix
Overbury, Steven H
Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging
title Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging
title_full Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging
title_fullStr Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging
title_full_unstemmed Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging
title_short Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging
title_sort understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4236855/
https://www.ncbi.nlm.nih.gov/pubmed/25419195
http://dx.doi.org/10.1186/1556-276X-9-614
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