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Journal of Electron Microscopy Advance Access originally published online on February 11, 2009
Journal of Electron Microscopy 2009 58(3):167-174; doi:10.1093/jmicro/dfp003
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

This article appears in the following Journal of Electron Microscopy issue: Special number: Advanced electron microscopy in materials physics [View the issue table of contents]

Three-dimensional shapes and structures of lamellar-twinned fcc nanoparticles using ADF STEM

Lionel C. Gontard1,2*, Rafal E. Dunin-Borkowski1,2, Mhairi H. Gass3, Andrew L. Bleloch3 and Dogan Ozkaya4

1 Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
2 Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK
3 SuperSTEM Laboratory, Daresbury Laboratory, Daresbury WA4 4AD, UK
4 Johnson Matthey Technology Centre, Blount's Court, Sonning Common, Reading RG4 9NH, UK

* To whom correspondence should be addressed. E-mail: lionel.gontard{at}cen.dtu.dk

Small particles with face-centred cubic structures can have non-single-crystallographic shapes. Here, an approach based on annular dark-field scanning transmission electron microscopy (STEM) is used to obtain information about the crystal sub-units that make up supported and unsupported twinned Pt, Pt alloy and Au nanoparticles. The three-dimensional shapes of two types of lamellar-twinned particles (LTPs) of Pt are obtained using high-angle annular dark-field STEM. Possible growth mechanisms of the LTPs and origins for the contrast features in the recorded images are discussed.

Keywords     heterogeneous catalysis, nanoparticles, platinum, platinum alloys, electron tomography, nanoparticle shapes

Received     22 October 2008, accepted 14 January 2009


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