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

Abstract

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 × 10−7 to 1.3 × 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.

Facile One-Step Electrodeposition of Poly(L-Ornithine) Film on Glassy Carbon Electrodes for Sensitive Detection of Thiamethoxam

“…A variety of nanomaterials were used for their large specific surface area, good conductivity and catalytic performance, including metal nanoparticles, 11,12 carbon nanomaterials, [13][14][15] cyclodextrin 16 and calixarene. 17 And the most commonly used modification method is direct drop coating for its simple, fast and easy to operate. However, there are some things that deserve improvement.…”