Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan, Republic of China.
Precision and Materials Research Centre, National Taipei University of Technology, Taipei, Taiwan, Republic of China.
Mikrochim Acta. 2021 Oct 8;188(11):372. doi: 10.1007/s00604-021-05036-0.
The eco-friendly synthesis of metal oxides pn junction composite with high visible light absorption and its photoelectrochemical monitoring on antibiotics is reported. The InO-CuO pn heterojunction composite was successfully prepared by in-situ hydrothermal decoration of CuO on the prepared InO using a simple reflux method. The obtained nanorods like InO-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 InO-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 InO-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.
本文报道了一种具有高光吸收能力的环保型金属氧化物 pn 结复合材料的合成及其对抗生素的光电化学监测。采用简单的回流法，通过原位水热法在制备的 InO 上原位修饰 CuO，成功制备了 InO-CuO pn 异质结复合材料。所得的纳米棒状 InO-CuO pn 异质结具有高导电性和优异的稳定性，有利于促进奥硝唑（ONZ）的光电化学检测，奥硝唑在水生态毒理学中起着重要作用。通过光电流和紫外-可见研究分析了 InO-CuO 异质结复合材料的光稳定性和光学特性。通过 Mott-Schottky 分析得出适当的能带水平，提出了 ONZ 信号的机制。优化后的 InO-CuO 异质结在-0.45 V（相对于 Ag/AgCl）工作电位下，在 0.05-65.3 nM 的范围内检测到 ONZ，检测限为 0.0092 nM。该传感器器件在含有 ONZ 的鸡肉、人尿和湖水样品中的实际应用进行了测试。实际样品的回收率均高于 95%，并与电化学方法进行了比较。
