Surface Manipulation of the Electronic Energy of Subnanometer-Sized Gold Clusters: An Electrochemical and Spectroscopic Investigation
Surface Manipulation of the Electronic Energy of Subnanometer-Sized Gold Clusters: An Electrochemical and Spectroscopic Investigation
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DOI：
10.1021/nl025809j
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发表时间：
2003
期刊：
影响因子：
10.8
通讯作者：
Yiyun Yang;Shaowei Chen
中科院分区：
文献类型：
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作者：
Yiyun Yang;Shaowei Chen
合成了稳定的十一金团簇，并用烷基硫醇盐单层保护。的颗粒被发现表现出半导体电子特性的带隙约为1.8 eV，从伏安法和光谱测量评价。还从840 nm处的峰位置观察到可见光范围内的光致发光。间接带隙特性表明纳米粒子分子中存在大量的表面陷阱态。然而，在与烷硫醇进行交换反应之前，没有观察到金颗粒Au11Cl3（PPh3）7的发光。这是解释，至少部分地，通过配位场的电子（带隙）的能量分裂和由此产生的电子分布的影响。这些观察结果强烈表明，表面化学在决定这些亚纳米级金粒子的电子能量结构方面起着至关重要的作用。
Stable undecagold clusters were synthesized and protected with a monolayer of alkanethiolates. The particles were found to exhibit semiconductor electronic characteristics with a band gap of about 1.8 eV, as evaluated from voltammetric and spectroscopic measurements. Photoluminescence in the visible range was also observed from the peak position at 840 nm. The indirect band-gap characteristics indicate that there exist substantial surface trap states in the nanoparticle molecules. Prior to exchange reactions with alkanethiols, however, no luminescence was observed with the gold particles, Au11Cl3(PPh3)7. This was interpreted, at least in part, by the effect of ligand fields on the electronic (band-gap) energy splitting and the resulting electron distributions. These observations strongly suggest that surface chemistry plays a vital role in determining the electronic energy structure of these subnanometer-sized gold particles.