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A Snapshot of the Properties of Single Nanoparticles at the Moment of a Collision

机译：碰撞瞬间单个纳米粒子特性的快照

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摘要

Direct electrochemical characterization of freely moving nanoparticles (NPs) at the individual particle level is challenging. A method is presented that can achieve this goal based on the collision between a NP and an ultramicroelectrode (UME). By applying a sinusoidal potential to the UME and monitoring the current response in the frequency domain, a sudden change in the phase angle indicates the arrival of a NP at the UME. The response induced by the collision can be isolated and used to explore the properties of the NP. This method, analogous to a high-speed camera, can obtain a snapshot of the properties of the single NP at the moment of a collision. The proposed method was employed to investigate the properties of both the hard catalytic Pt NP and soft electroactive emulsion droplets, and many new insights were revealed thereafter. The method also has the potential to be applied in many other fields, where the interested signals appear as discrete events.
机译：在单个颗粒水平上自由移动的纳米颗粒（NPs）的直接电化学表征具有挑战性。提出了一种可基于NP与超微电极（UME）之间的碰撞实现此目标的方法。通过在UME上施加正弦波电势并监视频域中的电流响应，相位角的突然变化表明NP到达UME。可以将碰撞引起的响应进行隔离，并用于探索NP的特性。与高速相机类似，此方法可以在发生碰撞时获取单个NP属性的快照。所提出的方法用于研究硬催化Pt NP和软电活性乳液液滴的性质，此后发现了许多新见解。该方法也有可能应用于许多其他领域，其中感兴趣的信号显示为离散事件。

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