Hierarchical ZnO nanorod-array films with enhanced photocatalytic performance
Hierarchical ZnO nanorod-array films with enhanced photocatalytic performance
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DOI：
10.1016/j.tsf.2012.09.083
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发表时间：
2013-01-15
期刊：
影响因子：
2.1
通讯作者：
Lin, Chung-Kwei
中科院分区：
文献类型：
--
作者：
Chang, Chi-Jung;Hsu, Mu-Hsiang;Lin, Chung-Kwei
通过连续形成ZnO微条纹和ZnO纳米棒阵列，制备了具有两个尺度表面粗糙度的分级薄膜光催化剂。去除喷墨打印的脊后，制备出具有微尺度粗糙度的ZnO条纹。然后，通过在表面上生长ZnO纳米棒来实现纳米级的粗糙度。采用场发射扫描电镜（FESEM）、X射线衍射（XRD）、光电子能谱（XPS）、光致发光（PL）和紫外-可见光谱（UV-vis）等手段对样品的表面形貌、结构和光学性能进行了表征。利用扫描电化学显微镜和扫描光纤研究了选择性生长的ZnO纳米棒在紫外光和可见光照射下的光电流。包括分级微结构和纳米结构的表面不仅增加了光催化剂的表面积，而且有助于有机染料在光降解测试期间的扩散。与ZnO纳米棒光催化剂相比，分级薄膜光催化剂的光降解效率有所提高。当银纳米粒子沉积在分级光催化剂上时，光催化性能进一步增强。(c)2012 Elsevier B. V.保留所有权利。
Hierarchical thin-film photocatalysts exhibiting surface roughness at two length scales were prepared by the consecutive formation of ZnO microstripes and ZnO nanorod-array. ZnO stripes with microscale roughness were fabricated after removing the ink-jet printed ribs. Then, nanoscale roughness was achieved by the growth of ZnO nanorods on the surface. The surface morphology and structural and optical properties were characterized by FESEM, X-ray diffraction, XPS, photoluminescence and UV-vis spectroscopy. The photocurrents of selectively grown ZnO nanorods under UV or visible light irradiation were investigated by scanning electrochemical microscopy with a scanning optical fiber. The surface comprising hierarchical microstructures and nanostructures not only increases the surface area of the photocatalyst but also helps the diffusion of organic dye during the photodegradation test. The photodegradation efficiency of the hierarchical thin-film photocatalyst was improved compared with the ZnO nanorod photocatalyst. Photocatalytic performance was further enhanced when Ag nanoparticles were deposited on the hierarchical photocatalyst. (c) 2012 Elsevier B.V. All rights reserved.