Electrochemical Detection of Nanoparticle Collision by Reduction of Silver Chloride
Electrochemical Detection of Nanoparticle Collision by Reduction of Silver Chloride
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DOI：
10.1149/2.0191604jes
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发表时间：
2016-01-01
影响因子：
3.9
通讯作者：
Zhang, Bo
中科院分区：
文献类型：
--
作者：
Hao, Rui;Fan, Yunshan;Zhang, Bo
我们报道了一种新的检测方案，用于检测和研究单个金属纳米颗粒在碳超微电极(UME)上的离散碰撞事件。单个纳米粒子碰撞的检测是基于当金属纳米粒子表面的氯化银(AgCl)扩散并与经AgCl修饰的碳UME衬底进行电接触时，它们在金属纳米粒子表面快速电催化还原。单个碰撞事件可以通过简单的方波电压波形记录为碳UME上的单个毫秒电流脉冲。在这项工作中，我们同时检测到了80 nm的银纳米颗粒和4 nm的金纳米颗粒。这种方法简单而强大，可以连续记录几个小时的纳米颗粒碰撞事件。此外，该方法使用表面支撑的固体氯化银，不涉及体液中添加的氧化还原物种。因此，纳米粒子的稳定性受其他氧化还原物种的影响较小，如联氨。(三)2016中国电化学会。版权所有。
We report a new detection scheme to detect and study discrete collisional events of single metal nanoparticles on a carbon ultramicroelectrode (UME). Detection of single nanoparticle collision is based on rapid electrocatalytic reduction of silver chloride (AgCl) on metal nanoparticle surfaces when they diffuse and make electrical contacts with a AgCl-modified carbon UME substrate. Single collisional events can be recorded as individual millisecond current pulses on a carbon UME by a simple square wave voltage waveform. Detections of both 80-nm silver and 4-nm gold nanoparticles are demonstrated in this work. This method is simple yet powerful and allows continuous recording of nanoparticle collision events for hours. Moreover, this method uses surface-supported solid AgCl and does not involve added redox species in the bulk solution. Therefore, nanoparticle stability can be less affected by the presence of other redox species, such as hydrazine. (C) 2016 The Electrochemical Society. All rights reserved.