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Enhanced Photoelectrochemistry in CdS/Au Nanoparticle Bilayers

机译：CdS / Au纳米颗粒双层中增强的光电化学

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摘要

Three different configurations of Au-nanoparticle/CdS-nanoparticle arrays are organized on Au/quartz electrodes for enhanced photocurrent generation. In one configuration, Au-nanoparticles are covalently linked to the electrode and the CdS-nanoparticles are covalently linked to the bare Au-nanoparticle assembly. The resulting photocurrent, φ = 7.5 %, is ca. 9-fold higher than the photocurrent originating from a CdS-nanoparticle layer that lacks the Au-nanoparticles, φ = 0.8 %. The enhanced photocurrent in the Au/CdS nanoparticle array is attributed to effective charge separation of the electron-hole pair by the injection of conduction-band electrons from the CdS- to the Au-nanoparticles. Two other configurations involving electrostatically stabilized bipyridinium-crosslinked Au/CdS or CdS/Au nanoparticle arrays were assembled on the Au/quartz crystal. The photocurrent quantum yields in the two systems are φ = 10 % and φ = 5 %, respectively. The photocurrents in control systems that include electrostatically bridged Au/CdS or CdS/Au nanoparticles by oligocationic units that lack electron-acceptor units are substantially lower than the values observed in the analogous bipyridinium-bridged systems. The enhanced photocurrents in the bipyridinium-crosslinked systems is attributed to the stepwise electron transfer of conduction-band electrons to the Au-nanoparticles by the bipyridinium relay bridge, a process that stabilizes the electron-hole pair against recombination and leads to effective charge separation.
机译：在Au /石英电极上组织了三种不同配置的Au-纳米颗粒/ CdS-纳米颗粒阵列，以增强光电流的产生。在一种配置中，Au-纳米颗粒共价连接至电极，而CdS-纳米颗粒共价连接至裸露的Au-纳米颗粒组件。产生的光电流φ= 7.5％，约为。 φ= 0.8％，比缺乏Au纳米粒子的CdS纳米粒子层产生的光电流高9倍。 Au / CdS纳米颗粒阵列中增强的光电流归因于通过将导电带电子从CdS-注入到Au纳米颗粒中而实现的电子-空穴对有效电荷分离。在Au /石英晶体上组装了涉及静电稳定的联吡啶联吡啶的Au / CdS或CdS / Au纳米颗粒阵列的两个其他配置。两个系统中的光电流量子产率分别为φ= 10％和φ= 5％。在控制系统中，通过缺乏电子受体单元的寡阳离子单元，通过静电桥联的Au / CdS或CdS / Au纳米粒子形成的控制系统中的光电流明显低于在类似的双吡啶桥联系统中观察到的值。联吡啶交联体系中增强的光电流归因于联吡啶中继桥将导带电子逐步转移到金纳米颗粒，该过程稳定了电子-空穴对的重组并导致有效的电荷分离。

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  • 来源
    《Advanced Functional Materials》 |2004年第5期|p. 416-424|共9页
  • 作者

    Laila Sheeney-Haj-Ichia; Svetlana Pogorelova; Yosef Gofer; Itamar Willner;

  • 作者单位

    Institute of Chemistry, Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Jerusalem 91904, Israel;

    Institute of Chemistry, Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Jerusalem 91904, Israel;

    Department of Chemistry, Bar-Ilan University, Ramat Gan, 52900, Israel;

    Institute of Chemistry, Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Jerusalem 91904, Israel;

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  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
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