Imprinted polypyrrole recognition film @cobalt oxide/electrochemically reduced graphene oxide nanocomposite for carbendazim sensing

A sensitive carbendazim (CBZ) voltammetric sensor based on cobalt oxide/electrochemically reduced graphene oxide (CoOx/ERGO) is designed using an imprinted polypyrrole (PPy) film. The CoOx layer was electrodeposited onto the ERGO modified glassy carbon electrode (ERGO/GCE), followed by the electrosynthesis of PPy in the presence of CBZ as a template. This sensor integrates the specificity of the imprinted PPy receptor to CBZ and the synergistic properties of electrocatalytic activity and active surface area of CoOx and ERGO. The sensor’s formation was investigated by scanning electron microscope (SEM) and electrochemical approaches in the presence of [Fe(CN)6]3−/4− probe. The CoOx/ERGO modified GCE exhibited an enchantment peak current for about 6 times to GCE. The experimental parameters related to the formation of nanohybrid, and the imprinted polymer were optimized. The oxidation peak current of CBZ ip is linearly correlated to the CBZ concentrations in a range of 0.01 nM to 10 μM CBZ with a limit of detection of ca, 0.01 nM. The sensor was successfully tested in CBZ detection in apple and tomato.