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Self‐Powered Photoelectrochemical Biosensor Based on CdS/RGO/ZnO Nanowire Array Heterostructure
Author(s) -
Zhao Kun,
Yan Xiaoqin,
Gu Yousong,
Kang Zhuo,
Bai Zhiming,
Cao Shiyao,
Liu Yichong,
Zhang Xiaohui,
Zhang Yue
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201502042
Subject(s) - heterojunction , materials science , graphene , nanowire , nanotechnology , biosensor , optoelectronics , oxide , charge carrier , metallurgy
A CdS/reduced graphene oxide (RGO)/ZnO nanowire array (NWAs) heterostructure is designed, which exhibits enhanced photoelectrochemical (PEC) activity compared to pure ZnO, RGO/ZnO, and CdS/ZnO. The enhancement can be attributed to the synergistic effect of the high electron mobility of ordered 1D ZnO NWAs, extended visible‐light absorption of CdS nanocrystals, and the formed type II band alignment between them. Moreover, the incorporation of RGO further promotes the charge carrier separation and transfer process due to its excellent charge collection and shuttling characteristics. Subsequently, the CdS/RGO/ZnO heterostructure is successfully utilized for the PEC bioanalysis of glutathione at 0 V (vs Ag/AgCl). The self‐powered device demonstrates satisfactory sensing performance with rapid response, a wide detection range from 0.05 m m to 1 m m , an acceptable detection limit of 10 μ m , as well as certain selectivity, reproducibility, and stability. Therefore, the CdS/RGO/ZnO heterostructure has opened up a promising channel for the development of PEC biosensors.