Enhanced photoactivities of ternary composite coating by antireflection and double P–N heterojunctions

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• 作者：Gang Shi ; Jie Chen ; Caihua Ni ; Liping Zhang ; Dawei Wang…
• 刊名：Journal of Materials Science
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：52
• 期：4
• 页码：1981-1987
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics;
• 出版者：Springer US
• ISSN：1573-4803
• 卷排序：52

文摘

In this paper, we present a convenient and universal strategy to sequentially assemble titania (TiO₂) nanorods and polyaniline (PANI) nanoparticles on the Si wafers through hydrothermal synthesis and chemical oxidation. On the one hand, the composite coatings (PANI/TiO₂/Si) with hierarchical structures reduced the reflectivity to less than 5 % at the wavelengths from 200 to 2500 nm, namely increasing the absorption efficiency of incident light. On the other hand, the double P–N heterojunctions that the composite coatings developed could suppress the recombination of photogenerated carriers, namely enhancing utilization efficiency of absorbed light. The photocurrent density of PANI/TiO₂/Si was above two times higher than that of TiO₂/Si at 1.5 V of positive potentials. The application of such coatings in the photocatalysis area, which are fabricated with this method, is thus straightforward.