Haritha V S, Sarath Kumar S R, Rakhi R B
Department of Physics, University of Kerala, Kariavattom, Thiruvananthapuram 695581, India.
Department of Nanoscience and Nanotechnology, University of Kerala, Kariavattom, Thiruvananthapuram 695581, India.
ACS Omega. 2023 Feb 24;8(9):8695-8702. doi: 10.1021/acsomega.2c08077. eCollection 2023 Mar 7.
Imidacloprid (IMI) is a systemic insecticide, which is widely used for seed treatment and pest control in vegetables. The unwarranted presence of traces of IMI in vegetables and groundwater is a matter of grave concern which needs to be detected and quantified in order to effect remedial measures for the sake of food safety. In this work, we communicate the fabrication of tungsten sulfide (WS) nanosheets and the construction of an amperometric sensor for the precise determination of IMI. The sensor performances were evaluated by using cyclic voltammetry (CV). The presence of surface-active sites and the fast electron transfer on WS/GCE favored the electrochemical reduction of the aromatic nitro group in IMI. The developed IMI sensor displayed a linear range of IMI detection from 10 to 90 μM with a detection limit of 0.28 μM. The developed WS/GCE sensor also displayed good sensitivity, with a value of 3.98 μA μM cm. The electrochemical measurements demonstrated the superior selectivity of the constructed WS/GCE sensor for IMI detection, which makes it suitable for practical applications.
吡虫啉（IMI）是一种内吸性杀虫剂，广泛用于蔬菜种子处理和害虫防治。蔬菜和地下水中无端出现痕量IMI是一个令人严重关切的问题，为食品安全起见，需要对其进行检测和定量，以便采取补救措施。在这项工作中，我们报道了硫化钨（WS）纳米片的制备以及用于精确测定IMI的电流型传感器的构建。通过循环伏安法（CV）评估传感器性能。WS/GCE表面活性位点的存在和快速电子转移有利于IMI中芳香硝基的电化学还原。所开发的IMI传感器对IMI的检测线性范围为10至90μM，检测限为0.28μM。所开发的WS/GCE传感器还表现出良好的灵敏度，值为3.98μAμM cm。电化学测量证明了所构建的WS/GCE传感器对IMI检测具有优异的选择性，这使其适用于实际应用。
