Takayama Kouichi, Fujiwara Keigo, Kume Takahiro, Naya Shin-Ichi, Tada Hiroaki
Department of Applied Chemistry, School of Science and Engineering and ‡Environmental Research Laboratory, Kindai University , 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
J Phys Chem Lett. 2017 Jan 5;8(1):86-90. doi: 10.1021/acs.jpclett.6b02642. Epub 2016 Dec 13.
In the gold nanoparticle (Au NP)-loaded CdS film on fluorine-doped tin oxide electrode (Au/CdS/FTO), the localized plasmonic resonance excitation-induced electron injection from Au NP to CdS has been proven by photoelectrochemical measurements. Formation of ZnS thin films between the Au NP and CdS film leads to a drastic increase of the photocurrent under visible-light irradiation (λ > 610 nm) in a 0.1 M NaClO aqueous electrolyte solution due to the electron filtering effect. The photocurrent strongly depends on the thickness of the ZnS film, and the maximum value is obtained at a thickness as thin as 2.1 nm. Furthermore, the ZnS overlayer significantly stabilizes the photocurrent of the CdS/FTO electrode in a polysulfide/sulfide electrolyte solution even under the excitation of CdS (λ > 430 nm). This work presents important information about the design for new plasmonic photocatalysts consisting of plasmonic metal NPs and chalcogenide semiconductors with high conduction band edge.
在氟掺杂氧化锡电极（Au/CdS/FTO）上负载金纳米颗粒（Au NP）的硫化镉（CdS）薄膜中，光化学测量已证明局域表面等离子体共振激发诱导电子从Au NP注入到CdS。由于电子过滤效应，在Au NP和CdS薄膜之间形成硫化锌（ZnS）薄膜会导致在0.1 M次氯酸钠水溶液中可见光照射（λ > 610 nm）下光电流急剧增加。光电流强烈依赖于ZnS薄膜的厚度，在薄膜厚度仅为2.1 nm时可获得最大值。此外，即使在CdS激发（λ > 430 nm）下，ZnS覆盖层也能显著稳定CdS/FTO电极在多硫化物/硫化物电解质溶液中的光电流。这项工作提供了有关由具有高导带边缘的等离子体金属纳米颗粒和硫族化物半导体组成的新型等离子体光催化剂设计的重要信息。
