Enhanced photocatalytic activity of metal coated ZnO nanowires

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• 作者：Santanu Pyne ; Gobinda Prasad Sahoo ; Dipak Kumar Bhui ; Harekrishna Bar ; Priyanka Sarkar ; Sadhan Samanta ; Ashim Maity ; Ajay Misra ; ^{ajaymsr@yahoo.co.in}
• 关键词：ZnO ; Nanowire ; Nano-needles ; Nano-leaves ; SPR
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：2012
• 出版时间：July, 2012
• 年：2012
• 卷：93
• 期：Complete
• 页码：100-105
• 全文大小：864 K

文摘

A simple, facile and template free route has been described for the synthesis of ZnO nanowires. The morphology and structure of ZnO nanowires have been tuned by deposing silver and gold onto the surface of ZnO nanowire and this has been done by adding AgNO₃ and HAuCl₄ to aqueous suspension of ZnO. Our synthesized Ag and Au coated ZnO nanoparticles show different emissive property than the native ZnO nanowires. The photocatalytic degradation of Methylene Blue is also evaluated using ZnO and Ag and Au coated ZnO nanowires. It has been observed that Ag coated ZnO nano-needles exhibits significantly enhanced photocatalytic efficiency compare to ZnO nanowire and Au coated ZnO nano-leaves. Fluorescence spectra and surface structure of the samples with their photocatalytic activity indicates that surface deposited metal serves as an electron sinks to enhance the separation of photoinduced electrons from holes, leading to the formation of OH and it enhances their photocatalytic efficiency.