铂纳米团簇在修饰的HOPG表面的生长及性能表征  

Growth and characterization of platinum nanoclusters on modified HOPG surfaces

作　　者：张辉[1] 张镇[1] 姚运喜[1] 谭大力[1] 包信和[1] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《电子显微学报》2006年第4期287-292,共6页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.20573107;No.90206036)~~

摘　　要：用扫描隧道显微术研究了经过不同方法处理的高定向裂解石墨(HOPG)表面的性质以及铂在其上的成核和生长。通过控制氩刻及氧化时间,在HOPG表面制备出分布和大小均匀的坑。这些纳米坑具有较强的活性,在后面的金属铂沉积过程中成为铂团簇的成核中心。通过控制坑的密度和分布,可以很好地控制沉积的铂团簇的分布及大小。用X射线光电子能谱(XPS)对其电子性质进行了研究,并用高分辨电子能量损失谱(HREELS)研究了甲醇在该体系的吸附行为。Highly oriented pyrolytic graphite（HOPG） has widely been used as the substrate for growth of metal films and nanostructures. Due to the weak interaction with metal, however, it is rather difficult to achieve uniform metal clusters on it. By using Ar^＋ sputtering with subsequent thermal oxidation, we could be able to produce regularly distributed and uniform sized pits on the HOPG surfaces. These pits were found to be the nucleation centers of Pt nanoclusters, leading to the formation of uniform Pt nanocluster arrays, which form an ideal model catalyst system. The electronic property and the adsorption of methanol on Pt/HOPG were investigated by X-ray photoelectron spectroscopy（XPS） and high resolution electron energy loss spectroscopy（ HREELS）.

关 键 词：高定向裂解石墨 氩离子刻蚀 氧化 铂 纳米团簇 扫描隧道显微镜(STM) 

分 类 号：O561[理学—原子与分子物理]