Pulse electroanalysis at gold-gold micro-trench electrodes: chemical signal filtering.

Pulse electroanalysis at gold-gold micro-trench electrodes: chemical signal filtering.
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金-金微沟槽电极的脉冲电解分析:化学信号过滤。

DOI:
10.1039/c3fd00022b
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发表时间:
2013
影响因子:
3.4
通讯作者:
Dale SE
Dale SE
中科院分区:
化学2区
文献类型:
--
作者:
Dale SE

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微和纳米沟槽传感器系统的双恒电位控制为增强信号(采用反馈电流)和改善选择性(通过“化学过滤”)提供了新的机会。在这项研究中,这两种现象都利用了金-金微沟槽电极与ca。70 μm宽,约800 μm沟槽深度。在“发生-收集模式”下,反馈电流增强表现为对苯二酚/苯醌氧化还原体系。接下来,“调制器-传感器模式”实验被开发,其中一个电极电势被步进到负电势区域(采用正常脉冲伏安法)以在微沟槽中局部诱导振荡pH变化。由此产生的氢醌/苯醌可逆电位的偏移引起法拉第传感器信号(采用计时电流法)。该方法通过仅选择pH敏感的氧化还原过程,并且通过在低缓冲容量区域中显示增强的灵敏度,提供了“化学过滤器”。化学可逆的氢醌/苯醌系统的结果进行了对比的化学不可逆的氨氧化的检测。
Bipotentiostatic control of micro- and nano-trench sensor systems provides new opportunities for enhancing signals (employing feedback currents) and for improved selectivity (by “chemical filtering”). In this study both phenomena are exploited with a gold–gold micro-trench electrode with ca. 70 μm width and ca. 800 μm trench depth. In “generator–collector mode”, feedback current enhancement is demonstrated for the hydroquinone/ benzoquinone redox system. Next, a “modulator-sensor mode” experiment is developed in which one electrode potential is stepped into the negative potential region (employing the normal pulse voltammetry method) to induce an oscillating pH change locally in the micro-trench. The resulting shift in the hydroquinone/ benzoquinone reversible potential causes a Faradaic sensor signal (employing chronoamperometry). This method provides a “chemical filter” by selecting pH-sensitive redox processes only, and by showing enhanced sensitivity in the region of low buffer capacity. The results for the chemically reversible hydroquinone/ benzoquinone system are contrasted to the detection of the chemically irreversible ammonia oxidation.
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