Plasmonic-enhanced self-cleaning activity on asymmetric Ag/ZnO surface-enhanced Raman scattering substrates under UV and visible light irradiation
Plasmonic-enhanced self-cleaning activity on asymmetric Ag/ZnO surface-enhanced Raman scattering substrates under UV and visible light irradiation
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DOI：
10.1039/c4ta00824c
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发表时间：
2014-05
影响因子：
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通讯作者：
Yashu Zang;Jun Yin;Xu He;Chuang Yue;Zhiming Wu;Jing Li;Junyong Kang
中科院分区：
文献类型：
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作者：
Yashu Zang;Jun Yin;Xu He;Chuang Yue;Zhiming Wu;Jing Li;Junyong Kang
制备了两种不同的非对称Ag/ZnO复合纳米阵列。这些纳米阵列被提出作为具有等离子体增强的紫外可见光催化性能的高灵敏度和均匀的表面增强拉曼散射（Sers）基底用于自清洁。非对称纳米结构由悬挂在ZnO中空纳米球内部或顶部的Ag纳米颗粒组成，这使得由于非对称介电环境而在接触区域附近产生强的局部电场。实验和模拟结果表明，这些非对称结构有利于在紫外和可见光照射下获得高的光催化活性，并提高Sers性能。采用基于带隙排列的电子转移模型进一步解释了光催化活性随波长变化的机理。由于光催化性能的显著提高，以及通过拉曼映射结果验证的可重复和均匀的Sers信号，大面积有序的非对称金属/半导体纳米阵列已被证明适合于在多功能光电化学芯片中的进一步应用。
Two different asymmetric Ag/ZnO composite nanoarrays were fabricated. These nanoarrays are proposed as highly sensitive and uniform surface-enhanced Raman scattering (SERS) substrates with plasmonic-enhanced UV-visible photocatalytic properties for self-cleaning. The asymmetric nanostructures are composed of Ag nanoparticles hanging inside or capping on the top of ZnO hollow nanospheres, which allows the generation of a strong local electric field near the contact area owing to the asymmetric dielectric environment. Experimental and simulation results showed that these asymmetric structures are favorable for achieving high photocatalytic activity under UV and visible light irradiation, in addition to improving the SERS performance. The electron transfer model based on band gap alignment was employed to further illustrate the mechanisms of the photocatalytic activity, which was dependent on the wavelength of the irradiation. Given the dramatically improved photocatalytic performance, together with the reproducible and uniform SERS signals verified by the Raman mapping results, the large area ordered asymmetric metal/semiconductor nanoarrays have been demonstrated to be suitable for further applications in multifunctional photoelectrochemical chips.