Three-dimensional shapes and structures of lamellar-twinned fcc nanoparticles using ADF STEM.
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.
Gontard
Lionel C
LC
Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark. lionel.gontard@cen.dtu.dk
Dunin-Borkowski
Rafal E
RE
Gass
Mhairi H
MH
Bleloch
Andrew L
AL
Ozkaya
Dogan
D