Waveguide-Plasmon Polariton Enhanced Photochemistry
Waveguide-Plasmon Polariton Enhanced Photochemistry
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DOI：
10.1002/adom.201500157
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发表时间：
2015-11-01
影响因子：
9
通讯作者：
Gomez, Daniel E.
中科院分区：
文献类型：
--
作者：
Ng, Charlene;Dligatch, Svetlana;Gomez, Daniel E.
等离子体增强的光催化的一个关键过程是热电荷载流子从金属纳米结构转移到光催化活性材料中。这个过程是次要的光吸收的金属纳米结构的初始步骤。这些结构中的光吸收可以通过设计具有定制光学截面的复杂几何形状来控制。在这里，一个最简单的纳米结构表现出等离子体共振的研究：金属线的一维光栅。这些阵列的周期性的影响的结果上的光的共振吸收和热电荷载流子转移到一个支持二氧化钛薄膜。通过跟踪溶液中有机小分子的光催化分解来监测这种电荷转移过程。强烈增强的分解率被发现表现出与测得的光学消光光谱的等离子体纳米结构的相关性。
One key process in plasmon-enhanced photocatalysis is the transfer of hot charge-carriers from metal nanostructures into photocatalytically active materials. This process is secondary to the initial step of light absorption by the metal nanostructures. Light absorption in these structures can be controlled by designing complex geometries with tailored optical cross-sections. Here, a study on one of the simplest nanostructures exhibiting plasmon resonances is presented: 1D gratings of metal wires. Results on the effect of the periodicity of these arrays are presented on the resonant absorption of light and on the hot charge-carrier transfer to a supporting TiO2 thin film. This charge transfer process is monitored by following the photocatalytic decomposition of small organic molecules in solution. Strong enhancements in the rate of decomposition are found that exhibit a correlation with the measured optical extinction spectra of the plasmonic nanostructures.