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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 exterior cage resembling a 3D Penrose tiling protects the M54 decahedral kernel. Compared to the discrete staple motifs in gold:thiolate nanoparticles, the Cu-thiolate surface of Au52Cu72 forms an extended cage. The Cu-SR Penrose tiling retains the M54 kernel's high symmetry (D5h). Third, interparticle interactions in the assembly are closely related to the symmetry of the particle, and a "quadruple-gear-like" interlocking pattern is observed.

SUBMITTER: Song Y 

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

REPOSITORIES: biostudies-literature

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Atomically resolved Au<sub>52</sub>Cu<sub>72</sub>(SR)<sub>55</sub> nanoalloy reveals Marks decahedron truncation and Penrose tiling surface.

Song Yongbo Y   Li Yingwei Y   Li Hao H   Ke Feng F   Xiang Ji J   Zhou Chuanjun C   Li Peng P   Zhu Manzhou M   Jin Rongchao R  

Nature communications 20200124 1

Gold-copper alloys have rich forms. Here we report an atomically resolved [Au<sub>52</sub>Cu<sub>72</sub>(p-MBT)<sub>55</sub>]<sup>+</sup>Cl<sup>-</sup> nanoalloy (p-MBT = SPh-p-CH<sub>3</sub>). This nanoalloy exhibits unusual structural patterns. First, two Cu atoms are located in the inner 7-atom decahedral kernel (M<sub>7</sub>, M = Au/Cu). The M<sub>7</sub> kernel is then enclosed by a second shell of homogold (Au<sub>47</sub>), giving rise to a two-shelled M<sub>54</sub> (i.e. Au<sub>52</su  ...[more]

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