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Published on: October 25, 2021
Three-dimensional shapes and structures of lamellar-twinned fcc nanoparticles using ADF STEM
Lionel C Gontard1, Rafal E Dunin-Borkowski, Mhairi H Gass
1Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark. lionel.gontard@cen.dtu.dk
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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