Preparation of an AgI/CuBi2O4 heterojunction on a fluorine-doped tin oxide electrode for cathodic photoelectrochemical assays: application to the detection of L-cysteine

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作者
Ling Zhang
Yu-Liang Shen
Gao-Chao Fan
Meng Xiong
Xiao-Dong Yu
Wei-Wei Zhao
机构
[1] Jiangsu University of Science and Technology,School of Biotechnology
[2] Qingdao University of Science and Technology,Shandong Key Laboratory of Biochemical Analysis, College of Chemistry and Molecular Engineering
[3] Nanjing University,State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering
来源
Microchimica Acta | 2019年 / 186卷
关键词
Photoelectrochemical sensing; CuBi; O; AgI; Heterojunction; Photocathodic sensing;
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摘要
Photocathodic methods in photoelectrochemical (PEC) analysis are based on the use of functional photocathodes. Heterojunction cathodes consisting of different kinds of semiconductors are being considered as favorite schemes when compared to the single-component ones. A semiconductor heterojunction between CuBi2O4 (CBO) and other semiconductors has not been exploited in PEC assays so far. Herein, CBO nanospheres were initially electrochemically deposited on a fluorine-doped tin oxide (FTO) conductive glass and then coupled to chemically deposited AgI nanoparticles to obtain an electrode of type AgI/CBO/FTO. It was applied as a cathode in the PEC detection of L-cysteine as a model analyte. The sensor can selectively detect L-cysteine, and it is assumed that this is due to the selective interaction between the L-cysteine and both copper and silver via the formation of Cu-S and Ag-S bonds. The photocurrent of the electrode increases linearly with the logarithm of the cysteine concentration in the range from 0.1 and 50 μM, and the detection limit is 0.1 μM.
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