银纳米团簇在HOPG表面上的控制生长  

Controlled growth of uniform silver clusters on HOPG

作　　者：王立莉[1] 马旭村[1] 齐云[1] 姜鹏[1] 焦健[2] 包信和[2] 贾金锋[1] 薛其坤[1] 

机构地区：[1]中国科学院物理研究所表面物理国家重点实验室,北京100080 [2]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《电子显微学报》2005年第1期1-5,共5页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No 10274044;No 10274002;No 10174089). ~~

摘　　要：由于银与高定向热解石墨(highlyorientedpyrolyticgraphite,HOPG)表面间的相互作用很小,银在HOPG表面上的生长通常采取三维的Volmer Weber模式,得到空间分布不均匀的银团簇。本文分别采用加热氧化和氩离子轰击来改变HOPG衬底的表面结构,并用扫描隧道显微镜(STM)研究了银在它们上面的生长过程。实验结果表明:在氩离子轰击过的HOPG表面上,可以得到大小基本一致、空间分布均匀的银纳米团簇,实现了银团簇的控制生长。氩离子轰击导致了平整的HOPG表面产生缺陷,这些缺陷对银原子的扩散进行限制并成为优先成核中心,最终形成均匀的银纳米团簇。Due to their high mobility and weak interaction with HOPG substrate, Ag atoms usually grow via the three-dimensional Volmer-Weber mode on HOPG and result in irregularly distributed silver clusters. To make uniformly sized and spaced Ag clusters, the HOPG surface was modified by thermal oxidization and Ar^+ sputtering before Ag deposition, respectively. Scanning tunneling microscopy (STM) observations revealed that uniformly sized and spaced Ag clusters could be formed on the sputtered surface. Ar^+ sputtering introduced relatively uniform surface defects. These defects served as preferential sites for Ag cluster nucleation and are found to be very important for the formation of uniform Ag clusters.

关 键 词：纳米团簇 轰击 表面 原子 氩离子 热解石墨 成核 改变 控制 实验结果 

分 类 号：O614[理学—无机化学]