Study of decahedral multimetallic nanoparticles using large-angle convergent-beam electron diffraction

Abstract

In this work, we characterize AuCuNiPd decahedral nanoparticles using advanced electron microscopy and computational techniques. Additionally, we introduce a novel method for analyzing asymmetrical HOLZ patterns, enabling highly precise lattice spacing determinations. By combining convergent beam electron diffraction (CBED) imaging with molecular dynamics simulations, we gain valuable insights into the structural properties of these nanoparticles. Our results reveal a globally distorted FCC lattice, best approximated by a body-centered tetragonal (BCT) structure with lattice parameters a = b = 0.287 nm and c = 0.415 nm. From LACBED analysis, the strain distribution in decahedra consists of two pairs of tetrahedra with distinct strain values, while the fifth tetrahedron exhibits a unique strain state.