文献类型：期刊文献

英文题名：Two-Dimensional Superlattices of Bi Nanoclusters Formed on a Au(111) Surface Using Porous Supramolecular Templates

作者：Zhang, Ran[1];Lyu, Guoqing[1];Chen, Cheng[1];Lin, Tao[1];Liu, Jun[2,3];Liu, Pei Nian[2,3];Lin, Nian[1]

机构：[1]Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Hong Kong, Peoples R China;[2]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2015

卷号：9

期号：8

起止页码：8547

外文期刊名：ACS NANO

收录：;EI(收录号：20153501215213);WOS:【SCI-EXPANDED(收录号:WOS:000360323300086)】；

基金：This work is financially supported by Hong Kong RGC 16303514 and NSFC (Project Nos. 21421004 and 21190033).

语种：英文

外文关键词：superlattice; supramolecular templates; Bi nanoclusters; scanning tunneling microscopy; kinetic Monte Carlo simulations

摘要：We used porous supramolecular structures as templates to make two-dimensional (2D) superlattices of Bi nanoclusters on a Au(111) surface. First, we applied on-surface self-assembly to prepare 2D porous supramolecular structures containing well-ordered nanopores. Then, we deposited Bi atoms on the surface. The Bi atoms were confined in the supramolecular pores and formed nanoclusters of a critical size that is defined by the pore size. These nanoclusters were arranged as a 2D superlattice dictated by the structure of the supramolecular templates. The nanocluster size and superlattice periodicity can be adjusted by appropriately designing the supramolecular structures. We further studied the formation mechanism of the nanoclusters. We found that Bi atoms could diffuse across the pore boundaries at room temperature and nucleated as clusters inside the pores. The clusters grew until they reached the critical size and became stable. We used kinetic Monte Carlo simulations to reproduce the experimental results and quantified the interpore diffusion barrier to be 0.65 eV.