Visible-light-induced photocatalysis of 2D-hexagonal mesoporous SiO2-TiO2 deposited with Au nanoparticles.
Visible-light-induced photocatalysis of 2D-hexagonal mesoporous SiO2-TiO2 deposited with Au nanoparticles.
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DOI：
10.1166/jnn.2014.8476
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发表时间：
2014-03
影响因子：
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通讯作者：
G. Kawamura;Teruhisa Okuno;H. Muto;A. Matsuda
中科院分区：
文献类型：
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作者：
G. Kawamura;Teruhisa Okuno;H. Muto;A. Matsuda
使用多种方法将金纳米颗粒 (NP) 沉积到溶胶-凝胶衍生的介孔 SiO2-TiO2 模板上。在沉积 Au 之前，用 3-氨基丙基三乙氧基硅烷 (APTES) 对模板进行修饰，导致在管状中孔中形成 Au 纳米棒而不是 Au 纳米球。这种修饰还会导致可见光诱导的光催化活性恶化。对该样品进行热处理以去除 APTES，从而改善光催化活性。从反应物对样品的可及性以及TiO2和Au NPs之间电荷载流子转移的容易程度讨论了活性恶化和改善的详细机制。
Au nanoparticles (NPs) are deposited using a couple of methods onto a sol-gel-derived mesoporous SiO2-TiO2 template. A modification of the template with 3-aminopropyltriethoxysilane (APTES) before the deposition of Au leads to the formation of Au nanorods instead of Au nanospheres in the tubular mesopores. The modification also causes a deterioration of visible-light-induced photocatalytic activity. Heat treatment of this sample to remove APTES results in an amelioration of the photocatalytic activity. The detailed mechanism of the deterioration and amelioration of the activity is discussed on the accessibility of the reactant to the sample and the easiness of the charge carrier transfer between TiO2 and Au NPs.