Scanning tunneling microscopy study of molecular growth structures of Gd@C_(82) on Cu(111)  

作　　者：陈建 秦志辉 潘金波 卢双赞 杜世萱 高鸿钧 曹更玉 

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]Institute of Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2013年第7期32-36,共5页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.11004219);MOST of China(Grant No.2013CBA01600)

摘　　要：The coverage and temperature-dependent nucleation behaviors of the Gd@C82 metallofullerenes on Cu（111） have been studied by low-temperature scanning tunneling microscopy （LT-STM） in detail. Upon molecular deposition at low temperature, Gd@C82 molecules preferentially decorate the steps and nucleate into single layer islands with increasing coverage. Further annealing treatment leads some of the Gd@C82 molecules to assemble into bright and dim patches, which are correlated to the adsorption induced substrate reconstruction. Upon sufficient thermal activation, Gd@C82 molecules sink into the Cu（111） surface one-copper-layer-deep, forming hexagonal close-packed molecular islands with intra-molecular details observed as striped patterns. By considering the commensurability between the Gd@C82 nearest-neighbor distance and the lattice of the underlying Cu（111）, we clearly identified two kinds of in-plane molecular arrangements as （19（1/2）×19（1/2））R23.4°and （19（1/2）×19（1/2））R36.6°with respect to Cu（111）. Within the assembled Gd@C82 molecular, island molecules with dim–bright contrast are spatially distributed, which may be modulated by the preexisted species on Cu（111）.The coverage and temperature-dependent nucleation behaviors of the Gd@C82 metallofullerenes on Cu（111） have been studied by low-temperature scanning tunneling microscopy （LT-STM） in detail. Upon molecular deposition at low temperature, Gd@C82 molecules preferentially decorate the steps and nucleate into single layer islands with increasing coverage. Further annealing treatment leads some of the Gd@C82 molecules to assemble into bright and dim patches, which are correlated to the adsorption induced substrate reconstruction. Upon sufficient thermal activation, Gd@C82 molecules sink into the Cu（111） surface one-copper-layer-deep, forming hexagonal close-packed molecular islands with intra-molecular details observed as striped patterns. By considering the commensurability between the Gd@C82 nearest-neighbor distance and the lattice of the underlying Cu（111）, we clearly identified two kinds of in-plane molecular arrangements as （19（1/2）×19（1/2））R23.4°and （19（1/2）×19（1/2））R36.6°with respect to Cu（111）. Within the assembled Gd@C82 molecular, island molecules with dim–bright contrast are spatially distributed, which may be modulated by the preexisted species on Cu（111）.

关 键 词：METALLOFULLERENE SELF-ASSEMBLY nucleation behaviors scanning tunneling microscopy 

分 类 号：O561[理学—原子与分子物理]