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Efficient Self-Assembly Synthesis of Uniform CdS Spherical Nanoparticles-Au Nanoparticles Hybrids with Enhanced Photoactivity

机译：高效自组装合成具有增强光活性的均匀CdS球形纳米颗粒-Au纳米颗粒杂化物

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摘要

The treatment of environmental pollution has become one of the most critical issues in the world. Despite the progress made in the study of semiconductor photocatalysis, it is still a challenge to obtain photocatalysts with high activity through relatively simple fabrication processes. In this work, monodisperse CdS spherical nanoparticles (SNPs) of various sizes and good crystallinity are obtained by only adjusting the starting ratio of reactants and the reaction temperature, exhibiting high photocatalytic performances. The photo-catalytic rate constant of the ≈ 100 nm CdS SNPs, especially, is more than double that of P25. Furthermore, 3-mercaptopropyltrimethoxysilane is used to assist the interaction between ≈ 200 nm CdS SNPs and citrate-stabilized Au nanoparticles (NPs). The significant increase of photocatalytic activity is confirmed by the degradation of Rodamine B (RhB) under Xe light irradiation. At the optimal Au concentration (0.5 wt%), the prepared nanohybrids show the highest photocatalytic activity, exceeding that of pure CdS two times. The superior photocatalytic performances of the CdS SNPs-Au nanohybrids can be attributed to the intimate interfacial contact between CdS SNPs and Au NPs, which is a contributing factor to the improvement of transfer and the fate of photogenerated charge carriers from CdS SNPs to Au NPs.
机译：处理环境污染已成为世界上最关键的问题之一。尽管在半导体光催化的研究方面取得了进展，但是通过相对简单的制备方法来获得具有高活性的光催化剂仍然是一个挑战。在这项工作中，仅调节反应物的起始比例和反应温度，即可获得各种尺寸和良好结晶度的单分散CdS球形纳米颗粒（SNP），并具有较高的光催化性能。 ≈100 nm CdS SNP的光催化速率常数尤其是P25的两倍以上。此外，使用3-巯基丙基三甲氧基硅烷来辅助≈200 nm CdS SNP与柠檬酸盐稳定的Au纳米颗粒（NP）之间的相互作用。 Xe光照射下罗丹明B（RhB）的降解证实了光催化活性的显着提高。在最佳Au浓度（0.5 wt％）下，制备的纳米杂化物显示出最高的光催化活性，是纯CdS的两倍。 CdS SNPs-Au纳米杂化物的出色的光催化性能可以归因于CdS SNPs和Au NPs之间的紧密界面接触，这是改善从CdS SNPs到Au NPs的转移和光生电荷载流子命运的一个重要因素。

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  • 来源
    《Advanced Functional Materials》 |2014年第24期|3725-3733|共9页
  • 作者

    Sancan Han; Linfeng Hu; Nan Gao; Ahmed A. Al-Ghamdi; Xiaosheng Fang;

  • 作者单位

    Department of Materials Science Fudan University Shanghai 200433, P. R. China;

    Department of Materials Science Fudan University Shanghai 200433, P. R. China;

    Department of Materials Science Fudan University Shanghai 200433, P. R. China;

    Physics Department Faculty of Science King Abdulaziz University Jeddah, Saudi Arabia;

    Department of Materials Science Fudan University Shanghai 200433, P. R. China;

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