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Dispersion and STM Characterization of Au-CdSe Nanohybrids on Au(111)
Bo Gao,Yan-min Kuang,Yuan Liao*,Zhen-chao Dong*
Author NameAffiliationE-mail
Bo Gao Hefei National laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Yan-min Kuang Hefei National laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Yuan Liao* Hefei National laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China liaoyuan@ustc.edu.cn 
Zhen-chao Dong* Hefei National laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China zcdong@ustc.edu.cn 
Abstract:
We report the dispersion and scanning tunneling microscopy (STM) characterization of iso-lated Au-CdSe nanohybrids on atomically flat Au(111) through surface modifications. The top terminal groups of spacer molecules self-assembled on the surface are found critical for locking the nanohybrids into a well-separated state. The STM results indicate that both thiol and carboxylic terminals are effective in this aspect by making strong interaction with the Au portions of the nanohybrids. An argon ion sputtering technique is also proposed to clean up organic contaminants on the surface for improved STM imaging of individual Au-CdSe nanohybrids. These observations help to enrich technical approaches to dispersing individual nanostructures on the surface and provide opportunities to explore their local electroluminescent and energy transfer properties at the nanoscale.
Key words:  Metal-semiconductor nanostructure, Nanoparticle dispersion, Sputter cleaning, Scanning tunneling microscopy, Plasmon-exciton coupling
FundProject:
Au-CdSe纳米异质结在Au(111)表面上的分散与STM表征
高博,邝艳敏,廖源*,董振超*
摘要:
研究单个Au-CdSe纳米异质结在经过表面修饰的Au(111)上的分散并进行STM表征. 发现衬底表面的自组装分子层的顶端功能基团对于形成良好的异质结分散状态非常重要. STM表明,巯基和羧酸基都能与异质结的Au纳米颗粒部分形成强烈的相互作用,从而将异质结有效地抓住,避免了团聚现象,便于异质结形成孤立分散的样品结构. 还可以采用条件适中的氩离子溅射技术来清除样品表面残留的有机物,从而得到较清晰的单个Au-CdSe纳米异质结的STM图像.
关键词:  金属-半导体纳米结构,纳米颗粒的分散,溅射清洗,扫描隧道显微学, 等离激元-激子耦合
DOI:10.1088/1674-0068/25/02/231-234
分类号: