Scalable one-step fabrication of integrated electrode arrays for highly sensitive and portable carbendazim detection

Abstract

Highly sensitive and portable pesticide residues detection are indispensable for safeguarding food safety and environmental health. Herein, we introduce a one-step vacuum filtration strategy for the scalable production of cobalt-based conjugated coordination polymers (CoCCPs) electrode arrays, utilizing carboxylated single-walled carbon nanotubes (c-SWNTs) as bonding bridges (CoCCPs@c-SWNTs). Due to their abundant active sites and high conductivity, the CoCCPs@c-SWNTs arrays exhibit superior electrochemical performance (e.g., active area, charge transfer capacity, adsorbed charge, etc.) and enhanced electrocatalytic activity for carbendazim (CBZ). Benefiting from the homogeneous and twining interface, the CoCCPs@c-SWNTs arrays also demonstrate good repeatability, reproducibility, and stability (relative standard deviations <5 %). The CoCCPs@c-SWNTs sensor, with a linear range of 0.01–4.0 μM and a detection limit of 1.9 nM, has been successfully employed in tea and strawberry samples. Overall, this novel sensor holds great potential for application in rapid on-site detection of pesticide residues.