Observation of Individual Semiconducting Nanoparticle Collisions by Stochastic Photoelectrochemical Currents
Observation of Individual Semiconducting Nanoparticle Collisions by Stochastic Photoelectrochemical Currents
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DOI：
10.1021/ja4007639
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发表时间：
2013-07-31
影响因子：
15
通讯作者：
Alpuche-Aviles, Mario A.
中科院分区：
文献类型：
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作者：
Fernando, Ashantha;Parajuli, Suman;Alpuche-Aviles, Mario A.
我们描述了一种方法来检测单个半导体纳米粒子（NP）使用在超微电极（UME）测量的光电化学（PEC）电流。我们使用二氧化钛纳米粒子的光氧化甲醇作为一个模型系统，在解决方案中。在恒定光照下悬浮在MeOH中的NP产生氧化MeOH的价带空穴。在UME处收集电子，并且电流与时间的数据显示离散的电流变化，其被分配给NP与UME的逐粒子相互作用。光电流的逐步变化表示NP与Pt UME的不可逆附着（
We describe a method to detect individual semiconducting nanoparticles (NPs) using the photo-electrochemical (PEC) current measured at an ultra-microelectrode (UME). We use photooxidation of MeOH by TiO2 NPs as a model system of photocatalysis in solution. NPs suspended in MeOH under constant illumination produce valence-band holes that oxidize MeOH. The electrons are collected at the UME, and the current-versus-time data show discrete current changes that are assigned to particle-by-particle interactions of the NPs with the UME. The stepwise changes in the photocurrent denote irreversible attachment of NPs to Pt UMEs (