Detecting Methamphetamine in Aerosols by Electroanalysis in a Soap Bubble Wall
Detecting Methamphetamine in Aerosols by Electroanalysis in a Soap Bubble Wall
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DOI：
10.1021/acs.analchem.2c00462
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发表时间：
2022-04-26
影响因子：
7.4
通讯作者：
Dick, Jeffrey E.
中科院分区：
文献类型：
--
作者：
Vannoy, Kathryn J.;Tarolla, Nicole E.;Dick, Jeffrey E.
我们提出了一种简便的方法来检测气溶胶中的甲基苯丙胺在肥皂泡壁电分析捕获气溶胶。将微丝穿过肥皂泡壁放置作为感测电极，沿着放置直径为1 mm的铂丝作为反电极/参比电极。所得到的电化学电池和电极几何形状是独特的，并且允许气泡壁之间的可再现电化学。我们首先提供了一个彻底的调查的细胞和电极的几何形状和电化学表征的二茂铁甲醇在由0.1 M KCl和0.1% Triton X-100（v/v）的肥皂泡壁。为了以数十纳米的分辨率可视化气泡润湿微丝的边界（有效电极面积），我们在碳微丝上电沉积铂。扫描电子显微镜和能量色散X射线光谱揭示了气泡接触（即，圆柱形电极高度）为157 ± 30 μ m。相关的数字显微镜表明，润湿达到r类似于125 μ m沿着气泡壁横向从微丝。超出润湿区域，气泡厚度为18 +/- 1 μ m，如探测溶解的双（联吡啶）氯化钌（II）的紫外-可见光谱实验所示。我们说明，在这个系统中的伏安特性是高度依赖于气泡润湿参数，这是通过改变微丝材料调谐。然后，我们将该系统应用于液体气溶胶中甲基苯丙胺的收集和电化学检测，其中气泡壁作为低容量收集器。
We present a facile method to detect methamphetamine in aerosols by trapping aerosols in a soap bubble wall for electroanalysis. A microwire was placed through a soap bubble wall as a sensing electrode along with a 1 mm diameter platinum wire as the counter/reference electrode. The resulting electrochemical cell and electrode geometry are unique and allow for reproducible electrochemistry between bubble walls. We first provide a thorough investigation of the cell and electrode geometry and an electrochemical characterization of ferrocene methanol in a soap bubble wall composed of 0.1 M KCl and 0.1% Triton X-100 (v/v). To visualize the boundary where the bubble wets the microwire (the effective electrode area) with tens of nanometer resolution, we electrodeposited platinum on carbon microwire. Scanning electron microscopy and energy dispersive X-ray spectroscopy revealed the bubble contact (i.e., cylindrical electrode height) is 157 +/- 30 mu m. Correlated digital microscopy suggests that the wetting reaches r similar to 125 mu m along the bubble wall laterally from the microwire. Beyond the wetting region, the bubble thickness is 18 +/- 1 mu m, as indicated by ultraviolet-visible spectroscopy experiments probing dissolved bis(bipyridine)ruthenium(II) chloride. We illustrate that the voltammetric character in this system is highly dependent on the bubble wetting parameters, which are tuned by changing the microwire material. We then applied this system to the collection and electrochemical detection of methamphetamine in liquid aerosols, where the bubble wall acts as a low volume collector.