Synthesis of Au-Decorated V2O5@ZnO Heteronanostructures and Enhanced Plasmonic Photocatalytic Activity

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• 作者：Haihong Yin ; Ke Yu ; Changqing Song ; Rong Huang ; Ziqiang Zhu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：September 10, 2014
• 年：2014
• 卷：6
• 期：17
• 页码：14851-14860
• 全文大小：677K
• ISSN：1944-8252

文摘

A ternary plasmonic photocatalyst consisting of Au-decorated V₂O₅@ZnO heteronanorods was successfully fabricated by an innovative four-step process: thermal evaporation of ZnO powders, CVD of intermediate on ZnO, solution deposition of Au NPs, and final thermal oxidization. SEM, TEM, EDX, XPS, and XRD analyses revealed that the interior cores and exterior shells of the as-prepared heteronanorods were single-crystal wurtzite-type ZnO and polycrystalline orthorhombic V₂O₅, respectively, with a large quantity of Au NPs inlaid in the V₂O₅ shell. The optical properties of the ternary photocatalyst were investigated in detail and compared with those of bare ZnO and V₂O₅@ZnO. UV鈥搗is absorption spectra of ZnO, V₂O₅@ZnO, and Au-decorated V₂O₅@ZnO showed gradually enhanced absorption in the visible region. In addition, gradually decreased emission intensity was also observed in the photoluminescence (PL) spectra, revealing enhanced charge separation efficiency. Because of these excellent qualities, the photocatalytic behavior of the ternary photocatalyst was studied in the photodegradation of methylene blue under UV鈥搗is irradiation, which showed an enhanced photodegradation rate nearly 7 times higher than that of bare ZnO and nearly 3 times higher than that of V₂O₅@ZnO, mainly owing to the enlarged light absorption region, the effective electron鈥揾ole separation at the V₂O₅鈥揨nO and V₂O₅鈥揂u interfaces, and strong localization of plasmonic near-field effects.

Keywords:

heteronanostructures; photocatalysis; plasmonic properties; ZnO; V₂O₅