Fabrication of Shape-Controlled Au Nanoparticles in a TiO2-Containing Mesoporous Template Using UV Irradiation and Their Shape-Dependent Photocatalysis
Fabrication of Shape-Controlled Au Nanoparticles in a TiO2-Containing Mesoporous Template Using UV Irradiation and Their Shape-Dependent Photocatalysis
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DOI：
10.1016/j.jmst.2013.08.008
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发表时间：
2014-01
影响因子：
10.9
通讯作者：
Teruhisa Okuno;G. Kawamura;H. Muto;A. Matsuda
中科院分区：
文献类型：
--
作者：
Teruhisa Okuno;G. Kawamura;H. Muto;A. Matsuda
采用溶胶-凝胶法制备了具有有序管状介孔结构的SiO2-TiO 2模板。Au纳米棒沉积在SiO2-TiO 2模板的管状介孔中，热沉积过程中通过紫外光照射使Au的形状由纳米棒转变为纳米球。评价了含/不含Au纳米棒/纳米球的介孔SiO2-TiO 2光催化活性。Au在介孔SiO2-TiO 2模板中的沉积增强了TiO 2的介孔性。有趣的是，含有Au纳米棒的样品比含有Au纳米球的样品表现出更高的光催化活性。无论沉积的Au纳米颗粒的形状如何，在复合样品中均未检测到通过激发表面等离子体共振的光催化作用。
A SiO2–TiO2template with ordered tubular mesochannels has been prepared by the sol–gel method. Au nanorods are deposited in the tubular mesochannels of the SiO2–TiO2template, and the shape of Au is changed from nanorods to nanospheres by ultraviolet irradiation during thermal deposition. The photocatalytic activity of mesoporous SiO2–TiO2with/without Au nanorods/nanospheres is evaluated. Deposition of Au in the mesoporous SiO2–TiO2template enhances the photocatalysis of TiO2. Interestingly, the sample containing Au nanorods exhibits higher photocatalytic activity than that with Au nanospheres. Photocatalysis by exciting surface plasmon resonance is not detected in the composite samples regardless of the shape of the deposited Au nanoparticles.