Fabrication of 3D biomimetic composite coating with broadband antireflection, superhydrophilicity, and double p-n heterojunctions

作     者：Gang Shi Xin Zhang Jianhua Li Haiyan Zhu Ying Li Liping Zhang Caihua Ni Lifeng Chi 

作者机构：The Key Laboratory of Food Colloids and Biotechnology Ministry of Education School of Chemical and Material Engineering Jiangnan University Wuxi 214122 China National Engineering Laboratory for Cereal Fermentation Technology Jiangnan University Wuxi 214122 China Institute of Functional Nano and Soft Materials (FUNSOM) Soochow University Suzhou 215123 China Physikalisches Institut and Center for Nanotechnology (CeNTech) Westfalische Wilhelms-Universitat Munster Munster D-48149 Germany 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2017年第10卷第7期

页      面：2377-2385页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 081701[工学-化学工程] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：This work was supported by the National Natural Science Foundation of China (Nos. 21401079  21501069  and 21671081)  Fundamental Research Funds for the Central Universities (No. JUSRP51626B)  and Natural Science Foundation of Jiangsu Province (Nos. BK20140158 and BK20161128) 

主　　题：biomimetic compositecoating broadband antireflection superhydrophilicity double p-n heterojunctions 

摘      要：The traditional single material with two-dimensional （2D） biomimetic moth-eye structures is limited by its narrowband antireflection and single functional capability. To overcome these disadvantages, we exploited wet etching and hydrothermal synthesis coupled with chemical oxidation for fabricating a three- dimensional （3D） biomimetic moth-eye coating with ternary materials （polypyrrole nanoparticles, TiO2 nanorods, and Si micropyramids, i.e., PPy/TiOa/Si-p）. This coating reduced the reflectivity to 〈4% at wavelengths ranging from 200 to 2,300 nm and exhibited remarkable superhydrophilidty with a low water contact angle of 1.8°. Moreover, the composite coating had double p-n heterojunctions, allowing the high-efficiency separation of photogenerated carriers. The photo- current density of PPy/TiO2/Si-p was more than three times higher than that of TiO2/Si-p at a positive potential of 1.5 V. The proposed method provides a means to enhance solar energy conversion.