A Robust Electrochemical Sensor for Determination of Thiamethoxam Based on Electrochemical Reduced Graphene Oxide-Cationic Pillar[6]arene Composite Film

On the surface of a glassy carbon electrode, electrochemically reduced graphene oxide-cationic pillar[6]arene (ErGO-CP6) composite film was constructed using a pulsed potential method. UV-vis spectra, SEM, Raman spectra and electrochemical experiments were applied to characterize the composite film. It was then used as a new electrochemical sensing platform for determination of thiamethoxam. Due to the synergistic effect of ErGO and CP6, this composite film shows a higher sensitivity and better selectivity toward thiamethoxam than that of ErGO film. The linear range from 1.0 x 10(-7) to 1.3 x 10(-5) mol l(-1) was obtained by differential pulse voltammetry. Meanwhile, the method was applied to cucumber and tomato samples in a recovery test. The recovery was between 92.0% and 98.7%, and the results are satisfactory. This study presents a promising electrochemical sensing platform for rapid and sensitive analysis of thiamethoxam.

Automated summary

The study constructed an ErGO-CP6 composite film as a new electrochemical sensing platform for the determination of thiamethoxam using a pulsed potential method. The composite film demonstrated higher sensitivity and selectivity towards thiamethoxam compared to an ErGO film, with satisfactory results in recovery tests on cucumber and tomato samples. This promising electrochemical sensing platform offers rapid and sensitive analysis of thiamethoxam.