Design and Fabrication of Silver Nanoparticles Doped β-cyclodextrin-chitosan Functionalized Graphene Nanocomposite Modified Electrode for Determination of Cu(II)

Abstract

Introduction: In this study, a nanocomposite film was prepared by doping silver nanoparticles onto β-cyclodextrin-chitosan functionalized Reduced Graphene Oxide (RGO), denoted as Ag/ β-CD/CS/G nanocomposite. The average diameter of the Ag NPs was found to be 62±17 nm. Methods: The fabricated composite was applied to monitor trace levels of copper ions in different industrial and environmental water samples. The morphology and microstructure of the fabricated sensor were extensively investigated using different techniques, including XRD, TGA, HR-TEM, FTIR, SEM, XPS, and EDX physicochemical techniques. For the electrochemical monitoring of Cu(II), the Ag/β-CD/CS/G nanocomposite electrode showed remarkable performance in terms of high sensitivity and a low limit of detection that was found to be 0.24 nmol L-1. Results: The developed sensors showed a linear dynamic range from 10-3 to 10-8 mol L-1 with an R2 of 0.99. The impacts of different electrochemical parameters, including medium pH, scanning rate, and interfering ions, were investigated. Conclusion: Furthermore, the fabricated modified electrode showed high efficiency for Cu(II) detection in groundwater samples.