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Iodide sensing via electrochemical etching of ultrathin gold films

机译：通过电化学蚀刻超薄金膜进行碘化物感测

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摘要

Iodide is an essential element for humans and animals and insufficient intake is still a major problem. Affordable and accurate methods are required to quantify iodide concentrations in biological and environmental fluids. A simple and low cost sensing device is presented which is based on iodide induced electrochemical etching of ultrathin gold films. The sensitivity of resistance measurements to film thickness changes is increased by using films with a thickness smaller than the electron mean free path. The underlying mechanism is demonstrated by simultaneous cyclic voltammetry experiments and resistance change measurements in a buffer solution. Iodide sensing is conducted in buffer solutions as well as in lake water with limits of detection in the range of 1 mu M (127 mu g L-1) and 2 mu M (254 mu g L-1), respectively. In addition, nanoholes embedded in the thin films are tested for suitability of optical iodide sensing based on localized surface plasmon resonance.
机译：碘化物是人类和动物必不可少的元素，摄入不足仍然是一个主要问题。需要负担得起且准确的方法来定量生物和环境流体中的碘化物浓度。提出了一种简单且低成本的传感装置，该装置基于碘化物诱导的超薄金膜的电化学蚀刻。通过使用厚度小于电子平均自由程的薄膜，可以提高电阻测量对薄膜厚度变化的敏感性。通过同时循环伏安法实验和缓冲溶液中的电阻变化测量证明了其潜在机理。碘离子检测可在缓冲溶液以及湖水中进行，检测限分别为1μM（127μg L-1）和2μM（254μg L-1）。另外，基于局部表面等离子体激元共振，测试了嵌入薄膜中的纳米孔对光学碘化物传感的适用性。

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