Gold-gold junction electrodes:the disconnection method.

Gold-gold junction electrodes:the disconnection method.
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金-金连接电极:断开法。

DOI:
10.1002/tcr.201100008
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发表时间:
2012
期刊:
Chemical record (New York, N.Y.)
影响因子:
--
通讯作者:
Dale SE
Dale SE
中科院分区:
--
文献类型:
--
作者:
Dale SE

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本文描述了用于电分析的金-金结电极的形成,其基于从非氰化物镀金浴中的电沉积。两个半球形金沉积物在两个相邻的铂微电极上的会聚生长(玻璃中直径均为100 µm,45 µm间隙),然后在氯化物水溶液中小心蚀刻。在生长过程中,两个金半球“连接”,并在蚀刻过程中“断开”是明显的电流下降。形成具有亚微米间隙的金-金结,并将其用于0.1 M磷酸盐缓冲液pH 7中亚微摩尔浓度的对苯二酚(Erev= 0.04 V vs. SCE)和0.1 M磷酸盐缓冲液pH 7中亚微摩尔浓度的多巴胺(Erev= 0.14 V vs. SCE)的电分析检测。讨论了金-金结电极在分析中的潜在未来用途和局限性。DOI 10.1002/tcr.201100008
The formation of gold‐gold junction electrodes for application in electroanalysis is described here based on electro‐deposition from a non‐cyanide gold plating bath. Converging growth of two hemispherical gold deposits on two adjacent platinum microelectrodes (both 100 µm diameter in glass, ca. 45 µm gap) followed by careful etching in aqueous chloride solution was employed. During growth both gold hemispheres “connect” and during etching “disconnection” is evident in a drop in current. Gold‐gold junctions with sub‐micron gaps are formed and applied for the electroanalytical detection of sub‐micromolar concentrations of hydroquinone in 0.1 M phosphate buffer pH 7 (Erev= 0.04 V vs. SCE) and sub‐micromolar concentration of dopamine in 0.1 M phosphate buffer pH 7 (Erev= 0.14 V vs. SCE). The potential future uses in analysis and limitations of gold‐gold junction electrodes are discussed.DOI 10.1002/tcr.201100008
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