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

• DOI: 10.1093/jmicro/dfp003
• Publication Date: 2009-02-11T20:54:14Z
• Authors: L. C. Gontard; R. E. Dunin-Borko...; M. H. Gass; A. L. Bleloch; D. Ozkaya
• Keywords: Dark field microscopy

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 Au nanoparticles. The three-dimensional shapes of two types lamellar-twinned (LTPs) are obtained using high-angle STEM. Possible growth mechanisms LTPs origins for contrast features in recorded images discussed.