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首页> 外文期刊>Materials Chemistry and Physics >Improved photoelectrochemical detection of mercury (II) with a TiO_2-modified composite photoelectrode
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Improved photoelectrochemical detection of mercury (II) with a TiO_2-modified composite photoelectrode

机译：TiO_2修饰的复合光电极改进了对汞（II）的光电化学检测

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摘要

The spectrophotometric change of a mercury (II) (Hg~(2+)) selective small molecule chemosensor has been successfully converted into a photovoltaic response upon ligating Hg~(2+). The photon excitation was followed by charge separation facilitated by TiO_2 and polyaniline (PANI), resulting in an electron transfer to an electrical back contact. The photoresponse of the Hg~(2+) selective chromophore was converted to an electron current equivalent to the amount of Hg~(2+) in solution. The favourable properties of a Hg~(2+) sensitive chemosensor was combined with the semiconductor capabilities of TiO_2 to construct a sensor that is capable of generating a current in the presence of Hg~(2+) under illumination. A composite of the fluorescent chemosensor rhodamine 6G hydrozone derivative (RS) and PANI was immobilized on indium tin oxide (ITO) plates coated with TiO_2 and subjected to photovoltammetric measurements. The photovoltammet-ric responses of the coated layers were investigated to determine the sensitivity and selectivity of the immobilized sensor to Hg~(2+) in the presence of background ions. The photo-response increased linearly with increasing Hg~(2+) concentration from 10 to 200 μg L~(-1) with a limit of quantification (LOQ) of 4 μg L~(-1). The pH independence for the photoresponse was limited by the TiO_2 layer and was optimal between pH 6 and 7.
机译：汞（II）（Hg〜（2+））选择性小分子化学传感器的光度学变化已成功地转化为连接Hg〜（2+）的光电响应。在光子激发之后，通过TiO_2和聚苯胺（PANI）促进电荷分离，从而导致电子转移到电背触点。 Hg〜（2+）选择性发色团的光响应被转换为相当于溶液中Hg〜（2+）的电子电流。将Hg〜（2+）敏感的化学传感器的良好性能与TiO_2的半导体功能相结合，以构建能够在光照下在Hg〜（2+）存在的情况下产生电流的传感器。荧光化学传感器若丹明6G氢氧衍生物（RS）和PANI的复合材料固定在涂有TiO_2的铟锡氧化物（ITO）板上，并进行了伏安法测量。研究了涂层的光伏响应，以确定在背景离子存在下固定传感器对Hg〜（2+）的敏感性和选择性。随着Hg〜（2+）的浓度从10μgL〜（-1）增加到线性，定量限（LOQ）为4μgL〜（-1）线性增加。 TiO_2层限制了光响应的pH独立性，并且在pH 6至7之间最佳。

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  • 来源
    《Materials Chemistry and Physics》 |2012年第1期|10-16|共7页
  • 作者

    Jessica Chamier; Andrew M. Crouch;

  • 作者单位

    Department of Chemistry and Polymer Science, University of Stellenbosch, Matieland X1, Stellenbosch 7602, South Africa,Council for Scientific and Industrial Research, Natural Resources and the Environment, P.O. Box 320, Stellenbosch 7599, South Africa;

    Institute of Molecular Sciences, Faculty of Science, University of the Witwatersrand, Private Bag 3, Wits, 2050, Johannesburg, South Africa;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    photoelectrochemical cells; mercury (II); rhodamine 6G; TiO_2; polyaniline;

    机译：光电化学电池汞（II）;罗丹明6G;TiO_2;聚苯胺;

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