Ag@Cu2O Core-Shell Nanoparticles as Visible-Light Plasmonic Photocatalysts
Ag@Cu2O Core-Shell Nanoparticles as Visible-Light Plasmonic Photocatalysts
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DOI：
10.1021/cs300672f
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发表时间：
2013-01-01
期刊：
影响因子：
12.9
通讯作者：
Wu, Nianqiang
中科院分区：
文献类型：
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作者：
Li, Jiangtian;Cushing, Scott K.;Wu, Nianqiang
与原始的氧化亚铜纳米粒子（NPs）相比，由于银核中存在局域表面等离子体共振（LSPR），银@氧化亚铜核 - 壳纳米粒子在更宽的波长范围内表现出光催化活性。光催化作用光谱和瞬态吸收测量表明，等离子体能量通过等离子体诱导共振能量转移（PIRET）和直接电子转移（DET）同时从金属转移到半导体，在半导体中产生电子 - 空穴对。银@氧化亚铜核 - 壳纳米粒子的LSPR带随着氧化亚铜壳层厚度的增加而发生红移，将银@氧化亚铜异质结构的光吸收扩展到更长的波长。因此，通过在纳米尺度上调节壳层厚度，银@氧化亚铜核 - 壳纳米粒子的光催化活性会发生变化。这项工作表明，银@氧化亚铜核 - 壳异质结构是一种高效的可见光等离子体光催化剂，通过调整壳层厚度，可以在整个可见光区域实现可调的光吸收。
Compared to pristine Cu2O nanoparticles (NPs), Ag@Cu2O core-shell NPs exhibit photocatalytic activity over an extended wavelength range because of the presence of localized surface plasmon resonance (LSPR) in the Ag core. The photocatalysis action spectra and transient absorption measurements show that the plasmonic energy is transferred from the metal to the semiconductor via plasmon-induced resonant energy transfer (PIRET) and direct electron transfer (DET) simultaneously, generating electron hole pairs in the semiconductor. The LSPR band of Ag@Cu2O core-shell NPs shows a red-shift with an increase in the Cu2O shell thickness, extending the light absorption of Ag@Cu2O heterostructures to longer wavelengths. As a result, the photocatalytic activity of the Ag@Cu2O core-shell NPs is varied by modulation of the shell thickness on the nanometer scale. This work has demonstrated that the Ag@Cu2O core-shell heterostructure is an efficient visible-light plasmonic photocatalyst, which allows for tunable light absorption over the entire visible-light region by tailoring the shell thickness.