3D‐Architectured MoS₂‐Microflower‐Modified Electrodes toward Electrochemical Determination of Imidacloprid

Abstract

We report the fabrication and analytical performance studies of electrochemical sensors based on hydrothermally grown 3D MoS 2 -microflower-modified Glassy Carbon (GCE) and Carbon Paste Electrodes (CPE) for the sensitive detection of the insecticide imidacloprid (IMI). As compared to MoS 2 /GCE, the fabricated MoS 2 /CPE demonstrates a faster electron transfer and better catalytic ability. MoS 2 /CPE sensor delivers its best performance towards the determination of IMI in PBS solution of pH 7.4, owing to its porous nature which can accommodate a higher number of active electrochemical reaction sites. The sensor exhibits a sensitivity value of 2.296 μA μM À 1 cm À 2 with lower detection and quantification limits of 12 � 0.24 nM and 40 � 0.8 nM respectively. The proposed sensor also exhibits linearity in the detection of IMI from 1 to 100 μM.

WS2-Nanosheet-Modified Electrodes as an Efficient Electrochemical Sensing Platform for the Nonenzymatic Detection of the Insecticide Imidacloprid

“…Graphene and its composites with metal nanostructures and polymers have been reported to be excellent sensor materials for the detection and quantification of IMI. − However, other classes of 2D materials such as transition-metal dichalcogenides (TMDs) have remained less examined as transducers in the electrochemical sensing of IMI. TMDs are the inorganic analogues of graphene, having exciting applications in a wide variety of fields such as electronics, optoelectronics, catalysis, and biosensors. − Among TMDs, MoS 2 is generally accepted for biosensing applications, but others like WS 2 ,, which share a similar structure but offer unique optical and electronic properties, remain comparatively less investigated. The typical WS 2 nanostructures have exceptional optical and electronic properties with superior electrical conductivity, and this property can be tuned by manipulating the crystal structure and the number of layers.…”