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Nano Research

Article Title

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

Authors

Gang Shi, The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
Xin Zhang, The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
Jianhua Li, The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
Haiyan Zhu, The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
Ying Li, 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
Liping Zhang, The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
Caihua Ni, The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
Lifeng Chi, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China Physikalisches Institut and Center for Nanotechnology (CeNTech), Westflische Wilhelms-Universitt Münster, Münster D-48149, Germany

Keywords

biomimetic composite coating, broadband antireflection, superhydrophilicity, double p-n heterojunctions

Abstract

ABSTRACT 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 threedimensional (3D) biomimetic moth-eye coating with ternary materials (polypyrrole nanoparticles, TiO2 nanorods, and Si micropyramids, i.e., PPy/TiO2/Si-p). This coating reduced the reflectivity to <4% at wavelengths ranging from 200 to 2,300 nm and exhibited remarkable superhydrophilicity 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 photocurrent 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.

Graphical Abstract

Publisher

Tsinghua University Press

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