Near-surface strain in icosahedra of binary metallic alloys: segregational versus intrinsic effects.
basic_science · Level V
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- Record sourced from PubMed, PMID 24588256.
- Also identified by DOI 10.1021/nl404268f.
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Abstract
A systematic structural analysis of FePt, CuAu, and Au icosahedral nanoparticles is presented. The uncovered particles are prepared by inert gas condensation and thermally equilibrated through in-flight optical annealing. Aberration-corrected high-resolution transmission electron microscopy reveals that the crystal lattice is significantly expanded near the particle surface. These experimental findings are corroborated by molecular statics simulations that show that this near-surface strain originates from both intrinsic strain due to the icosahedral structure and a partial segregation of the larger of the two alloy constituents to the particle surface.