Plasmon-induced charge separation at two-dimensional gold semishell arrays on SiO2@TiO2 colloidal crystals
Plasmon-induced charge separation at two-dimensional gold semishell arrays on SiO2@TiO2 colloidal crystals
复制标题
DOI：
10.1063/1.4922935
复制
发表时间：
2015-06
期刊：
影响因子：
6.1
通讯作者：
L. Wu;Hiroyasu Nishi;T. Tatsuma
中科院分区：
文献类型：
--
作者：
L. Wu;Hiroyasu Nishi;T. Tatsuma
开发了基于等离子体金半壳（或半壳）阵列的光电极。在TiO2涂覆的透明电极上制备了由SiO2@TiO2核壳颗粒组成的胶体晶体。通过溅射或蒸发在胶体晶体上沉积金半壳（或半壳）阵列。具有半壳（或半壳）阵列的电极在含有电子供体的水性电解质中在500-800 nm波长的可见光下表现出负光势位移和阳极光电流。特别是对苯二酚和乙醇是良好的电子供体。光电流可以用 Au-TiO2 界面上等离激元引起的电荷分离来解释。
Photoelectrodes based on plasmonic Au semishell (or halfshell) arrays are developed. A colloidal crystal consisting of SiO2@TiO2 core-shell particles is prepared on a TiO2-coated transparent electrode. A Au semishell (or halfshell) array is deposited by sputtering or evaporation on the colloidal crystal. An electrode with the semishell (or halfshell) array exhibits negative photopotential shifts and anodic photocurrents under visible light at 500-800 nm wavelengths in an aqueous electrolyte containing an electron donor. In particular, hydroquinone and ethanol are good electron donors. The photocurrents can be explained in terms of plasmon-induced charge separation at the Au-TiO2 interface.