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首页> 外文期刊>Mikrochimica Acta: An International Journal for Physical and Chemical Methods of Analysis >A cathodic photoelectrochemical sensor for chromium(VI) based on the use of PbS quantum dot semiconductors on an ITO electrode
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A cathodic photoelectrochemical sensor for chromium(VI) based on the use of PbS quantum dot semiconductors on an ITO electrode

机译:基于在ITO电极上使用PBS量子点半导体的铬(VI)的阴极光电化学传感器

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摘要

Under visible-light irradiation, a cathodic photoelectrochemical (PEC) sensor is presented for highly sensitive determination of Cr(VI) at a potential of -0.25 V (vs SCE). PbS quantum dots (QDs) were capped with mercaptoacetic acid and assembled on the surface of an indium tin oxide (ITO) electrode via the linker poly(diallyl dimethyl ammonium chloride) providing a photoactive sensor. Cr(VI) accepts the photoelectrons generated by the PbS QDs. This promotes the separation of electron holes and enhances the cathodic photocurrent generated by a 470-nm LED. The sensor has 10 pM detection limit and a linear working range from 0.02 nM to 2 mu M of chromate. The method was successfully applied to the determination of Cr(VI) and total chromium in spiked environmental water samples.
机译:在可见光照射下,呈现阴极光电化学(PEC)传感器以在-0.25V(VS SCE)的潜力下的CR(VI)的高敏感测定。 用巯基乙酸封端PBS量子点(QDS)并通过提供光活性传感器的接头聚(二甲基二甲基氯化铵)在氧化铟锡(ITO)电极的表面上。 Cr(vi)接受PBS QD产生的光电子。 这促进了电子孔的分离,并增强了由470nm LED产生的阴极光电流。 传感器具有10μm检测限,线性工作范围为0.02nm至2μm的铬酸盐。 该方法成功地应用于Cr(vi)和掺入环境水样中的总铬的测定。

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