Visible light-induced charge retention and photocatalysis with hybrid CdSe-Au nanodumbbells
Visible light-induced charge retention and photocatalysis with hybrid CdSe-Au nanodumbbells
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DOI：
10.1021/nl0730514
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发表时间：
2008-02-01
期刊：
影响因子：
10.8
通讯作者：
Banin, Uri
中科院分区：
文献类型：
--
作者：
Costi, Ronny;Saunders, Aaron E.;Banin, Uri
可见光催化是利用太阳能进行有用的化学反应并将光转化为化学能的一种有前途的途径。迄今为止使用的纳米级光催化系统主要基于氧化物半导体，并辅以金属沉积，并且仅在紫外线照射下工作。此外，对粒度和形状的控制程度有限。我们报告使用高度控制的混合金尖端的CdSe纳米棒（nanodumbbell）的可见光照射。在可见光照射下，混合颗粒的半导体和金属部分之间发生电荷分离。电荷分离状态然后用于模型受体分子亚甲蓝的直接光还原，或者可替代地，保留用于稍后在黑暗中进行还原反应。
Visible light photocatalysis is a promising route for harnessing of solar energy to perform useful chemical reactions and to convert light to chemical energy. Nanoscale photocatalytic systems used to date were based mostly on oxide semiconductors aided by metal deposition and were operational only under UV illumination. Additionally, the degree of control over particle size and shape was limited. We report visible light photocatalysis using highly controlled hybrid gold-tipped CdSe nanorods (nanodumbbells). Under visible light irradiation, charge separation takes place between the semiconductor and metal parts of the hybrid particles. The charge-separated state Was then utilized for direct photoreduction of a model acceptor molecule, methylene blue, or alternatively, retained for later use to perform the reduction reaction in the dark.