Electrochemical Sensor Based on Nafion/Gold Nanoparticle/Electrochemically Reduced Graphene Oxide Composite-Modified Glassy Carbon Electrode for the Detection of Diuron

Abstract

A novel sensitive electrochemical sensor based on a glassy carbon electrode (GCE) modified with a Nafion/gold nanoparticle/electrochemically reduced graphene oxide(Nafion/AuNPs/RGO) composite membrane was applied to detect diuron. The Nafion/AuNPs/RGO composites with the advantages of a large surface area, specific binding sites and a faster electron transfer rate were analysed. The synergistic effects of the RGO and AuNPs composites and the effective absorption of diuron resulted in a high interfacial conductivity. Therefore, the fabricated sensor showed excellent performance. The electrode exhibited a linear response from 1.0×10-12M to 1.0×10-9M for diuron and a detection limit of 4.1×10-13 M under the optimized conditions. Accordingly, reproducibility, stability and anti-interference tests were carried out. Furthermore, the designed sensor was utilized to detect diuron in real samples to evaluate the accuracy of the method. The recovery of diuron was 91.2%-108.2%. This approach provides a new avenue for the sensitive detection of diuron in practical applications.