In-situ preparation of CuO nanoparticles decorated In2O3 pn heterojunction composite for the photoelectrochemical detection of ornidazole

Autor: Thomas C.-K. Yang, Jyy-Ning Chen, Sethupathi Velmurugan, Liu Zhi-Xiang
Rok vydání: 2021
Předmět:
Zdroj: Microchimica Acta. 188
ISSN: 1436-5073
0026-3672
DOI: 10.1007/s00604-021-05036-0
Popis: The eco-friendly synthesis of metal oxides pn junction composite with high visible light absorption and its photoelectrochemical monitoring on antibiotics is reported. The In2O3-CuO pn heterojunction composite was successfully prepared by in-situ hydrothermal decoration of CuO on the prepared In2O3 using a simple reflux method. The obtained nanorods like In2O3-CuO pn heterojunction exhibited high conductivity with excellent stability for the facilitated photoelectrochemical detection of ornidazole (ONZ) that plays a role in aquatic toxicology. The photo-stability and optical characteristics of the In2O3-CuO heterojunction composite were analyzed through photocurrent and UV–visible studies. Mechanism of ONZ signaling has been proposed with appropriate band levels derived by Mott-Schottky analysis. An optimized In2O3-CuO heterojunction detects ONZ in the range 0.05–65.3 nM with 0.0092 nM as the limit of detection at − 0.45 V (vs. Ag/AgCl) working potential. The practical applicability of the sensor device was tested in chicken meat, human urine, and lake water samples containing ONZ. The recoveries of real samples were above 95% and results obtained were compared with electrochemical methods.
Databáze: OpenAIRE
Externí odkaz: