Electrochemical monitoring of catalytically amplified collisions of individual metal nanoparticles (NP) with ultramicroelectrodes (UME) has been extensively used to study electrocatalysis, mass-transport, and charge-transfer processes at the single NP level. More recently, photoelectrochemical collision experiments were carried out with semiconductive NPs. Here, we introduce two new types of light-controlled nanoimpact experiments. The first experiment involves localized photodeposition of catalyst (Pt) on TiO₂ NPs with a glass-sheathed carbon fiber simultaneously serving as the light guide and collector UME. The collisions of in situ prepared Pt@TiO₂ NPs with the carbon surface produced blips of water oxidation current, while the activity of pristine TiO₂ NPs was too low to yield measurable signal. In another experiment, collisions of catalytic (Ir oxide) NPs with the semiconductor (Nb doped n-type TiO₂ rutile single crystal) electrode are monitored by measuring the photocurrent of water oxidation.

中文翻译：

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光控纳米粒子碰撞实验

电化学监测单个金属纳米颗粒（NP）与超微电极（UME）的催化放大碰撞的方法已广泛用于研究单个NP水平的电催化，质量传输和电荷转移过程。最近，用半导体NP进行了光电化学碰撞实验。在这里，我们介绍两种新型的光控纳米冲击实验。第一个实验涉及用玻璃护套碳纤维同时充当光导和收集器UME的TiO ₂ NPs上催化剂（Pt）的局部光沉积。原位制备的Pt @ TiO ₂ NPs与碳表面的碰撞产生水氧化电流的爆发，而原始TiO的活性_2个NP太低而无法产生可测量的信号。在另一个实验中，通过测量水氧化的光电流来监测催化（Ir氧化物）NP与半导体（Nb掺杂的n型TiO ₂金红石型单晶）电极的碰撞。