期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 842, 期 -, 页码 161-167出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2019.04.070
关键词
Photoelectrochemical sensor; Oxytetracycline; Cu3Mo2O9; BaTiO3
资金
- National Natural Science Foundation of China [21777046]
- Guangzhou Science and Technology Project [201803030002]
- Natural Science Foundation of Guangdong Province [S2013010012678]
In this paper, an ultrasensitive photoelectrochemical sensor was developed for the detection of oxytetracycline, which was based on BaTiO3 sensitized Cu3Mo2O9 nano-composites with excellent visible-light photoelectrochemical activity. Cu3Mo2O9 nanocrystals (NCs) with popsicle-like morphologies were synthesized through hydrothermal method and showed a very high photoelectrochemical signal. To achieve larger photocurrent density, nanostructured BaTiO3 was then deposited on the surface of Cu3Mo2O9 photocathodes, which led to 3-fold enhancement of the photocurrent as compared to pristine Cu3Mo2O9 NCs. In order to obtain the specific response to oxytetracycline, oxytetracycline aptamer was fixed on the Au/BaTiO3/Cu3Mo2O9/FTO. Under visible light irradiation, the obtained aptamer/Au/BaTiO3/Cu3Mo2O9/FTO exhibited high sensitivity, good selectivity, outstanding reproducibility and low cost for detecting oxytetracycline. Furthermore, there was a linear relationship between detected signal and the oxytetracycline in the concentration range from 5 x 10(-10) to 10(-7) M, with a detection limit (3 S/N) of 4.6 x 10(-11) M under the optimal conditions. It is expected that this new photoelectric active material may have potential applications in biosensors, photocatalysis and other related fields.
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