Immobilization of quantum dots via conjugated self-assembled monolayers and their application as a light-controlled sensor for the detection of hydrogen peroxide.
Immobilization of quantum dots via conjugated self-assembled monolayers and their application as a light-controlled sensor for the detection of hydrogen peroxide.
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DOI：
10.1021/nn2035582
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发表时间：
2011-11
期刊：
影响因子：
17.1
通讯作者：
Waqas Khalid;M. El Helou;T. Murböck;Zhao Yue;J. Montenegro;Kirsten Schubert;G. Göbel;F. Lisdat;G. Witte;W. Parak
中科院分区：
文献类型：
--
作者：
Waqas Khalid;M. El Helou;T. Murböck;Zhao Yue;J. Montenegro;Kirsten Schubert;G. Göbel;F. Lisdat;G. Witte;W. Parak
提出了一种通过界面二硫醇连接层用 CdS 和 FePt 或 CdS@FePt 纳米粒子修饰的光寻址金电极。 XPS 测量表明，与苯二硫醇和联苯二硫醇相比，反式二苯乙烯二硫醇在高温下形成时可提供高质量的自组装单分子层。 CdS 纳米颗粒与电极具有良好的电接触，可以在光照和适当的极化下产生电流。 FePt 纳米颗粒充当过氧化氢还原成水的催化位点。有利地，可以通过使用借助优化的茋二硫醇层固定在电极上的混合纳米颗粒来组合这两种特性。这允许对不同过氧化氢浓度进行光控分析。
A light-addressable gold electrode modified with CdS and FePt or with CdS@FePt nanoparticles via an interfacial dithiol linker layer is presented. XPS measurements reveal that trans-stilbenedithiol provides high-quality self-assembled monolayers compared to benzenedithiol and biphenyldithiol, in case they are formed at elevated temperatures. The CdS nanoparticles in good electrical contact with the electrode allow for current generation under illumination and appropriate polarization. FePt nanoparticles serve as catalytic sites for the reduction of hydrogen peroxide to water. Advantageously, both properties can be combined by the use of hybrid nanoparticles fixed on the electrode by means of the optimized stilbenedithiol layer. This allows a light-controlled analysis of different hydrogen peroxide concentrations.