Plasmon-Enhanced Photocatalytic Activity of Cadmium Sulfide Nanoparticle Immobilized on Silica-Coated Gold Particles
Plasmon-Enhanced Photocatalytic Activity of Cadmium Sulfide Nanoparticle Immobilized on Silica-Coated Gold Particles
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DOI：
10.1021/jz2009049
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发表时间：
2011-08-18
影响因子：
5.7
通讯作者：
Ishihara, Hajime
中科院分区：
文献类型：
--
作者：
Torimoto, Tsukasa;Horibe, Hiroki;Ishihara, Hajime
制备了 CdS 纳米颗粒固定在 Au 核-SiO2 壳颗粒上的纳米复合光催化剂，其中 SiO2 层充当绝缘体层，以防止电子从光激发的 CdS 直接转移到 Au 颗粒。 CdS 颗粒对 H-2 析出的光催化活性很大程度上取决于 CdS 和 Au 颗粒之间的距离，这是由于 Au 颗粒的局域表面等离子体共振 (LSPR) 峰的光激发产生的局部增强电场。 Au 核尺寸的增加扩大了 Au 和 CdS 之间的最佳距离，从而增强了光催化作用。通过求解自洽方程组，理论上可以重现这种行为，其中随着金球直径的增大，能量耗散的范围变得更宽，然后改变了局域表面等离子体共振感应电场对 CdS 粒子光激发增强的平衡。
Nanocomposite photocatalysts of CdS nanoparticles immobilized on Au core-SiO2 shell particles, in which the SiO2 layer acts as an insulator layer to prevent direct electron transfer from photoexcited CdS to Au particles, were prepared. The photocatalytic activity of CdS particles for H-2 evolution was greatly dependent on the distance between CdS and Au particles, due to the locally enhanced electric field produced by photoexcitation of the localized surface plasmon resonance (LSPR) peak of Au particles. Increase in Au core size enlarged the optimal distance between Au and CdS for the enhancement of photocatalysis. This behavior was theoretically reproduced by solving a self-consistent equation system, in which the range of energy dissipation became wider for larger diameter of the Au sphere, and then the balance with the enhancement of photoexcitation of CdS particles by the LSPR-induced electric field was changed.