Observing Iridium Oxide (IrOx) Single Nanoparticle Collisions at Ultramicroelectrodes
Observing Iridium Oxide (IrOx) Single Nanoparticle Collisions at Ultramicroelectrodes
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DOI：
10.1021/ja106054c
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发表时间：
2010-09-29
影响因子：
15
通讯作者：
Bard, Allen J.
中科院分区：
文献类型：
--
作者：
Kwon, Seong Jung;Fan, Fu-Ren F.;Bard, Allen J.
我们描述了单氧化铱纳米粒子（IrOx NP）的碰撞NaBH 4处理的Pt超微电极（UME）的电化学检测。我们观察单NP事件通过增强电流电催化水氧化，当IrOx接触电极和瞬时坚持它。整个电流瞬态包括重复的电流尖峰，返回到背景水平，叠加在电流衰减，而不是楼梯响应看到NP坚持UME。这里，每个事件产生唯一的电流尖峰（或“尖峰”）。峰电流的频率与颗粒浓度成正比，峰电流随外加电位的增大而增大。所观察到的电流是非常敏感的测量电极的材料和表面状态; NaBH 4处理的Pt UME是重要的，在获得可重复的结果。
We describe the electrochemical detection of single iridium oxide nanoparticle (IrOx NP) collisions on a NaBH4-treated Pt ultramicroelectrode (UME). We observe single NP events through the enhanced current by electrocatalytic water oxidation, when IrOx contacts the electrode and transiently sticks to it. The overall current transient consists of repeated current spikes that return to the background level, superimposed on a current decay, rather than the staircase response seen where an NP sticks on the UME. Here each event produces a unique current spike (or "blip"). The frequency of the spikes was directly proportional to the particle concentration, and the peak current increased with the applied potential. The observed current is very sensitive to the material and surface state of the measuring electrode; a NaBH4-treated Pt UME was important in obtaining reproducible results.