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