Three-dimensional shapes and structures of lamellar-twinned fcc nanoparticles using ADF STEM.
J Electron Microsc (Tokyo)
; 58(3): 167-74, 2009 Jun.
Article
em En
| MEDLINE
| ID: mdl-19211653
ABSTRACT
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.
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MEDLINE
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En
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2009
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Article