Preparation of Gold/Silver/Titania Trilayered Nanorods and Their Photocatalytic Activities

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• 作者：Yoshimasa Horiguchi ; Takashi Kanda ; Kanjiro Torigoe ; Hideki Sakai ; Masahiko Abe
• 刊名：Langmuir
• 出版年：2014
• 出版时间：January 28, 2014
• 年：2014
• 卷：30
• 期：3
• 页码：922-928
• 全文大小：483K
• ISSN：1520-5827

文摘

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 (位 > 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.