Electrochemical Sensing Platform based on Greenly Synthesized Gum Arabic Stabilized Silver Nanoparticles for Hydrogen Peroxide and Glucose

Abstract

Gum Arabic stabilized silver nanoparticles (GA-Ag NPs) were successfully synthesized by one step green synthesis method. The as-prepared nanoparticles were characterized using XRD, DLS, FTIR, TEM, and UV–vis spectroscopy. XRD data confirmed that the synthesized Ag NPs were face-centred cubic and the crystallite size was calculated to be around 5 nm. TEM image confirmed the successful synthesis of monodispersed spherical nanoparticles with particle sizes in the range of 10–20 nm. Cyclic voltammetry experiment revealed the outstanding electrochemical response and electrocatalytic behaviour of GA-Ag NPs for the sensing of H2O2. Based on the cyclic voltammetry, amperometric, and differential pulse voltammetric (DPV) experiments, it was concluded that strong oxidizing agent H2O2 undergoes through reduction process at the surface of GA-Ag NPs/GCE. Excellent electrocatalytic behaviour of the GA-Ag NPs was exhibited for sensing of glucose also. The limit of detection as calculated from DPV experiments were 0.242 μM and 0.205 μM for H2O2 and glucose respectively. The reported electrochemical sensor has numerous advantages such as simple and green synthesis method, extremely high sensitivity, stability and reproducibility, and extremely good response.