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首页> 外文期刊>RSC Advances >Optimized design of multi-shell ZnO/TiO2/ZnSe nanowires decorated with Ag nanoparticles for photocatalytic applications
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Optimized design of multi-shell ZnO/TiO2/ZnSe nanowires decorated with Ag nanoparticles for photocatalytic applications

机译：Ag纳米粒子修饰的多壳ZnO / TiO2 / ZnSe纳米线的优化设计

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摘要

Composite nanomaterials consisting of semiconductor sensitizers and noble metal nanoparticles (NPs) exhibit great potential for high-efficiency photocatalytic applications. However, the differences in structure can significantly affect the light utilization efficiency and photocatalytic performance. In this study, we report the structural design of multi-shell coaxial nanowires (NWs) for their applications in photocatalytic degradation. Two types of multi-shell coaxial NWs, namely, ZnO/TiO2/ZnSe/Ag(NPs) and ZnO/TiO2/Ag(NPs)/ZnSe NWs, were successfully fabricated. Experimental and theoretical results revealed that surface structures and the position of Ag NPs in coaxial NWs significantly influenced the intensity of localized surface plasmon resonance, light absorption, and photocatalytic performance. The photocatalytic activity of the ZnO/TiO2/Ag(NPs)/ZnSe NWs was significantly enhanced under UV and visible light irradiation compared with that of the ZnO/TiO2/ZnSe/Ag(NPs) NWs. The improved performance was explained by electron transfer models combined with band structure alignment. Furthermore, an optimal NW structure was proposed on the basis of the analysis of photocatalytic mechanisms. This study provides guidance to the design of composite materials for high-efficiency photocatalytic applications.
机译：由半导体敏化剂和贵金属纳米颗粒（NPs）组成的复合纳米材料在高效光催化应用方面显示出巨大潜力。然而，结构上的差异会显着影响光利用效率和光催化性能。在这项研究中，我们报告了多壳同轴纳米线（NWs）在光催化降解中的应用的结构设计。成功地制造了两种类型的多壳同轴NW，即ZnO / TiO2 / ZnSe / Ag（NPs）和ZnO / TiO2 / Ag（NPs）/ ZnSe NW。实验和理论结果表明，同轴NWs的表面结构和Ag NPs的位置显着影响局部表面等离子体激元共振的强度，光吸收和光催化性能。与ZnO / TiO2 / ZnSe / Ag（NPs）NWs相比，在紫外和可见光照射下，ZnO / TiO2 / Ag（NPs）/ ZnSe NWs的光催化活性显着增强。通过电子转移模型结合能带结构排列来解释性能的提高。此外，在分析光催化机理的基础上，提出了一种最佳的NW结构。这项研究为高效光催化应用的复合材料设计提供了指导。

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