Preparation of Gold/Silver/Titania Trilayered Nanorods and Their Photocatalytic Activities
Preparation of Gold/Silver/Titania Trilayered Nanorods and Their Photocatalytic Activities
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DOI：
10.1021/la404370s
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发表时间：
2014-01-28
期刊：
影响因子：
3.9
通讯作者：
Abe, Masahiko
中科院分区：
文献类型：
--
作者：
Horiguchi, Yoshimasa;Kanda, Takashi;Abe, Masahiko
通过在金纳米棒芯上连续沉积银层和钛层，制备了金/银/钛三层纳米棒，并在可见光（λ > - 420 nm）下研究了其光催化活性。三层纳米棒氧化2-丙醇的光催化活性取决于Au/Ag的组成和TiO2壳层的厚度。当[Au]/[Ag] = 1:5（摩尔比）时，随Ag含量的增加而增大，而后随Ag含量的增加而减小。光催化活性随着TiO2的增加而增加，当膜厚达到10 nm时，光催化活性随膜厚的增加而降低。这些效应可以用电子转移和能量转移机制来解释。
Gold/silver/titania trilayered nanorods have been prepared by the successive deposition of silver and titania layers on gold nanorod cores, and their photocatalytic activities were investigated under visible-light illumination (lambda > 420 nm). The photocatalytic activity of the trilayered nanorods in the oxidation of 2-propanol depends on both the Au/Ag composition and the thickness of the TiO2 shell. It increases with increasing Ag content up to [Au]/[Ag] = 1:5 (molar ratio) and then decreases with further increasing Ag content. The photocatalytic activity also increases with increasing TiO2, shell thickness up to 10 nm and then decreases with further increases in the shell thickness. These effects were explained by electron-transfer and energy-transfer mechanisms.