Enhancing Photochemical Activity of Semiconductor Nanoparticles with Optically Active Ag Nanostructures: Photochemistry Mediated by Ag Surface Plasmons
Enhancing Photochemical Activity of Semiconductor Nanoparticles with Optically Active Ag Nanostructures: Photochemistry Mediated by Ag Surface Plasmons
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DOI：
10.1021/jp101633u
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发表时间：
2010-05-20
影响因子：
3.7
通讯作者：
Linic, Suljo
中科院分区：
文献类型：
--
作者：
Christopher, Phillip;Ingram, David B.;Linic, Suljo
由光学活性Ag纳米结构和TiO 2光催化剂组成的复合材料在亚甲基蓝的分解中显示出比纯TiO 2增强的光活性。增强的光化学活性归因于由表面等离子体介导的能量的辐射转移，从Ag颗粒到半导体，导致半导体中更高浓度的电荷载流子（e（-）/h（+）对），因此导致更高的光化学活性。我们证明，复合光催化剂的性能是一个强大的功能的大小和形状的银纳米结构。这可以通过银纳米结构的尺寸和形状特异性光学活性来解释。我们表明，通过合理地改变银纳米结构的尺寸和形状，它是可能的，以最大限度地提高在给定的激发波长的半导体的光化学活性。
Composite materials composed of optically active Ag nanostructures and TiO2 photocatalysts show enhanced photoactivity compared to the pure TiO2 in the decomposition of methylene blue. The enhanced photochemical activity is attributed to radiative transfer of energy, mediated by surface plasmons, from Ag particles to the semiconductor leading to higher concentrations of charge carriers (e(-)/h(+) pairs) in the semiconductor and therefore to higher photochemical activity. We demonstrate that the performance of the composite photocatalysts is a strong function of the size and shape of Ag nanostructures. This can be explained by the size- and shape-specific optical activity of Ag nanostructures. We show that by rationally changing the size and shape of Ag nanostructures it is possible to maximize photochemical activity of a semiconductor at a given excitation wavelength.