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Nano Research

Article Title

Self-powered photoelectrochemical biosensing platform based on Au NPs@ZnO nanorods array

Authors

Zhuo Kang, State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science andTechnology Beijing, Beijing 100083, China
Xiaoqin Yan, State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science andTechnology Beijing, Beijing 100083, China
Yunfei Wang, State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science andTechnology Beijing, Beijing 100083, China
Yanguang Zhao, State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science andTechnology Beijing, Beijing 100083, China
Zhiming Bai, State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science andTechnology Beijing, Beijing 100083, China
Yichong Liu, State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science andTechnology Beijing, Beijing 100083, China
Kun Zhao, State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science andTechnology Beijing, Beijing 100083, China
Shiyao Cao, State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science andTechnology Beijing, Beijing 100083, China
Yue Zhang, State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science andTechnology Beijing, Beijing 100083, China Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing 100083, China

Keywords

plasmonic gold nanoparticle, ZnO nanorod array, photoelectrochemical, biosensor, glutathione

Abstract

Photoanodes, which are used in photoelectrochemical (PEC) water splitting, have been shown to be applicable in the construction of a PEC biosensing platform. This was realized by replacing water oxidization with oxidation of an appropriate test molecule. Here, we have demonstrated the feasibility of adopting photoanodes consisting of zinc oxide nanorods arrays decorated with plasmonic gold nanoparticles (Au NPs@ZnO NRs) for the self-powered PEC bioanalysis of glutathione (GSH) in phosphate-buffered saline (PBS) at an applied bias potential of 0 V vs. Ag/AgCl. This heterostructure exhibited enhanced PEC properties because of the introduction of the Au/ZnO interface. Under visible light illumination, hot electrons from surface-plasmon resonance (SPR) at the Au NP surface were injected into the adjacent ZnO and subsequently driven to the photocathode. Under ultraviolet (UV) light illumination, the photogenerated electrons in ZnO tended to transfer to the fluorine-doped tin oxide due to the step-wise energy band structure and the upward energy band bending at the ZnO/ electrolyte interface. These results indicate that plasmonic metal/semiconductor heterostructure photoanodes have great potential for self-powered PEC bioanalysis applications and extended field of other photovoltaic beacons.

Graphical Abstract

Publisher

Tsinghua University Press

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