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Electrochemistry at Nanometer Length Scales

机译:纳米级电化学

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摘要

We briefly describe two sets of electrochemical experiments whose success and interpretation require explicit consideration of the role of distance at nanometer length scales. In the first section, measurements of the influence of adsorbed Cl~- on the dissolution rate of the ~2-nm-thick Al_2O_3 film on Al are reported, and analyzed in terms of the electric field across the oxide film. Knowledge of the potential-dependent film thickness, which varies by less than 1 nm during an experiment, is required to quantify dissolution rates. In the second section, we describe experiments using Pt electrodes to voltammetrically detect very small quantities (zeptomoles) of an electroactive species. Our strategy to detect such small amounts of analyte is based on shrinking the electrode size to nanometer length scales.
机译:我们简要描述了两组电化学实验,其成功和解释需要明确考虑距离在纳米长度尺度上的作用。在第一部分中,报告了吸附的Cl〜-对厚度约为2nm的Al_2O_3膜在Al上的溶解速率的影响的测量结果,并根据整个氧化膜上的电场进行了分析。需要了解电位依赖的膜厚度(在实验过程中变化幅度小于1 nm)以量化溶解速率。在第二部分中,我们描述了使用Pt电极以伏安法检测非常少量(Zeptomoles)的电活性物质的实验。我们检测如此少量分析物的策略是基于将电极尺寸缩小到纳米级。

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