Atomically resolved Au₅₂Cu₇₂(SR)₅₅ nanoalloy reveals Marks decahedron truncation and Penrose tiling surface.

ABSTRACT: Gold-copper alloys have rich forms. Here we report an atomically resolved [Au₅₂Cu₇₂(p-MBT)₅₅]⁺Cl^- nanoalloy (p-MBT = SPh-p-CH₃). This nanoalloy exhibits unusual structural patterns. First, two Cu atoms are located in the inner 7-atom decahedral kernel (M₇, M = Au/Cu). The M₇ kernel is then enclosed by a second shell of homogold (Au₄₇), giving rise to a two-shelled M₅₄ (i.e. Au₅₂Cu₂) full decahedron. A comparison of the non-truncated M₅₄ decahedron with the truncated homogold Au₄₉ kernel in similar-sized gold nanoparticles provides for the first time an explanation for Marks decahedron truncation. Second, a Cu₇₀(SR)₅₅

SUBMITTER: Song Y 

PROVIDER: S-EPMC6981204 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature