Yu Xin, Jin Xin, Chen Xuanyu, Wang Aizhu, Zhang Jianming, Zhang Jian, Zhao Zhenhuan, Gao Mingming, Razzari Luca, Liu Hong
Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan 250022, P. R. China.
INRS-EMT, 1650, Boulevard Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada.
ACS Nano. 2020 Oct 27;14(10):13876-13885. doi: 10.1021/acsnano.0c06278. Epub 2020 Sep 25.
The TiO/Au nanostructure has been acknowledged as one of the most classic visible-light active photocatalysts due to the surface plasmon resonance (SPR) of Au nanoparticles. In many cases, the SPR effect only features weak visible light absorption in conventional TiO/Au nanostructures. Here, we demonstrate a design of TiO/Au/TiO with a combination of whispering gallery mode (WGM) resonances and SPR for efficient visible-light-driven photocatalysis. () were used as natural reactants as well as a template to construct an -like TiO/Au/TiO nanostructure. Using numerical simulations, we show that the -like TiO capsule acts as the WGM resonator to interplay with the SPR effect of the Au NPs on TiO surface, which leads to a significant increase of visible light absorption and the local field enhancement at the Au-TiO interface. Accordingly, with the synergistic effect of WGM and SPR, the -like TiO/Au/TiO nanostructure exhibits enhanced photocatalytic activity in the visible range. Our work reveals a promising bioapproach to a design highly visible light active plasmonic photocatalyst.
由于金纳米颗粒的表面等离子体共振（SPR），TiO/Au纳米结构被认为是最经典的可见光活性光催化剂之一。在许多情况下，SPR效应在传统的TiO/Au纳米结构中仅表现出微弱的可见光吸收。在此，我们展示了一种结合回音壁模式（WGM）共振和SPR的TiO/Au/TiO设计，用于高效的可见光驱动光催化。（）被用作天然反应物以及构建类TiO/Au/TiO纳米结构的模板。通过数值模拟，我们表明类TiO胶囊充当WGM谐振器，与TiO表面上金纳米颗粒的SPR效应相互作用，这导致可见光吸收显著增加以及金-二氧化钛界面处的局部场增强。因此，在WGM和SPR的协同作用下，类TiO/Au/TiO纳米结构在可见光范围内表现出增强的光催化活性。我们的工作揭示了一种很有前景的生物方法，用于设计高可见光活性的等离子体光催化剂。
