Plasmon Enhanced Visible Light Photocatalytic Activity of Flower-like Au-TiO2 Core-shell Nanoparticles
首发时间:2020-09-21
Abstract:Flower-like Au-TiO2 core-shell nanoparticles (NPs) were synthesized by a facile and high-yield hydrothermal method in which gold NPs were used as cores and TiF4 was used as precursor. A series of characterizations were carried out to examine the morphology, crystallinity, and composition of the nanostructures. The Au-TiO2 core-shell NPs exhibit uniform flower-like morphology, porous TiO2 shells, and strong surface plasmon resonance (SPR) absorption band in the visible light region. Hence, compared with the hollow TiO2 NPs, the Au-TiO2 core-shell NPs exhibited greatly improved photocatalytic activity for the degradation of methylene blue under visible light irradiation. Such enhancement can be ascribed to the resonant energy transfer and direct electron transfer between TiO2 and Au parts in the core-shell nanostructures. We believe that such plasmonic photosensitizers based on this enhancement mechanism would offer much more flexibility for designing solar energy materials, photocatalysts and other optoelectronic devices.
keywords: Optics Plasmon Enhanced Visible Light photocatalysis TiO2
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花瓣状Au-TiO2核壳纳米结构中等离激元及其可见光催化特性研究
摘要:以金纳米颗粒为核,TiF4为前驱体,采用简便高效的水热法合成了花瓣状Au-TiO2核壳纳米结构。为检测纳米结构的形态,结晶度和组成,进行了一系列表征。 花瓣状Au-TiO2核-壳,多孔TiO2壳在可见光区域均表现出强表面等离激元(SPR)吸收带。因此,与中空的TiO2 NPs相比,Au-TiO2核壳NPs在可见光照射下对亚甲基蓝的降解表现出极大的光催化活性。这种增强可归因于核-壳纳米结构中TiO2和Au部分之间的共振能量转移和直接电子转移。基于这种增强机制的等离激元光敏剂将为设计太阳能材料,光催化剂和其他光电器件提供更大的灵活性。
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花瓣状Au-TiO2核壳纳米结构中等离激元及其可见光催化特性研究
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