Yang Jing, Deng Changxi, Zhong Wei, Peng Guanwei, Zou Jin, Lu Yan, Gao Yansha, Li Mingfang, Zhang Songbai, Lu Limin
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Key Laboratory of Chemical Utilization of Plant Resources of Nanchang, College of Chemistry and Materials, Jiangxi Agricultural University, Nanchang, 330045, China.
Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde, 415000, China.
Mikrochim Acta. 2023 Mar 21;190(4):146. doi: 10.1007/s00604-023-05734-x.
Heterostructured TiO@MXene rich in oxygen vacancies defects (VO-TiO@MXene) has been developed to construct an electrochemical sensing platform for imidacloprid (IMI) determination. For the material design, TiO nanoparticles were firstly in situ grown on MXene and used as a scaffolding to prevent the stack of MXene nanosheets. The obtained TiO@MXene heterostructure displays excellent layered structure and large specific surface area. After that, electrochemical activation is utilized to treat TiO@MXene, which greatly increases the concentration of surface oxygen vacancies (VOs), thereby remarkably enhancing the conductivity and adsorption capacity of the composite. Accordingly, the prepared VO-TiO@MXene displays excellent electrocatalytic activity toward the reduction of IMI. Under optimum conditions, cyclic voltammetry and linear sweep voltammetry techniques were utilized to investigate the electrochemical behavior of IMI at the VO-TiO@MXene/GCE. The proposed sensor based on VO-TiO@MXene presents an obvious reduction peak at -1.05 V(vs. Hg|HgCl) with two linear ranges from 0.07 - 10.0 μM and 10.0 - 70.0 μM with a detection limit of 23.3 nM (S/N= 3). Furthermore, the sensor provides a reliable result for detecting IMI in fruit and vegetable samples with a recovery of 97.9-103% and RSD≤ 4.3%. A sensitive electrochemical sensing platform was reported for imidacloprid (IMI) determination based on heterostructured TiO@MXene rich in oxygen vacancy defects.
富含氧空位缺陷的异质结构TiO@MXene（VO-TiO@MXene）已被开发用于构建一种用于测定吡虫啉（IMI）的电化学传感平台。在材料设计方面，首先在MXene上原位生长TiO纳米颗粒，并将其用作防止MXene纳米片堆叠的支架。所获得的TiO@MXene异质结构具有优异的层状结构和大比表面积。之后，利用电化学活化处理TiO@MXene，这大大增加了表面氧空位（VOs）的浓度，从而显著提高了复合材料的导电性和吸附能力。因此，制备的VO-TiO@MXene对IMI的还原显示出优异的电催化活性。在最佳条件下，利用循环伏安法和线性扫描伏安法研究了IMI在VO-TiO@MXene/GCE上的电化学行为。基于VO-TiO@MXene提出的传感器在-1.05 V（vs.Hg|HgCl）处呈现出明显的还原峰，线性范围为0.07 - 10.0 μM和10.0 - 70.0 μM，检测限为23.3 nM（S/N = 3）。此外，该传感器为检测水果和蔬菜样品中的IMI提供了可靠的结果，回收率为97.9 - 103%，相对标准偏差≤4.3%。报道了一种基于富含氧空位缺陷的异质结构TiO@MXene用于测定吡虫啉（IMI）的灵敏电化学传感平台。
