Abstract
A simple and environment friendly protocol has been developed for the synthesis of Ag nanoparticles (AgNPs) supported on reduced graphene oxide (rGO) with copper metal foil as reductant. The prepared AgNPs-rGO, nanocomposite was characterized by various analytical techniques such as scanning electron microscopy (SEM), field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD). The electrochemical performance of the material has been evaluated using cyclic voltammetry (CV), chronoamperometry and electrochemical impedance spectroscopy (EIS). The average crystallite size of AgNPs is found to be 32.34 nm. The application of prepared electrocatalyst (AgNPs-rGO) as a non-enzymatic sensor is examined through the modified electrode with the synthesized AgNPs-rGO. The sensor showed excellent performance toward H2O2 reduction with a sensitivity of 12.73 µA.cm-2.mM-1, with a linear dynamic range of 1.5 µM – 100 mM, and the detection limit of 1.90 µM (S/N = 3). Furthermore, the sensor displayed high sensitivity, reproducibility, stability and selectivity for the determination of H2O2. The results demonstrated that AgNPs-rGO has potential applications as sensing material for quantitative determination of H2O2.
Highlights
It is well known that hydrogen peroxide (H2O2) is an essential constituent in food, pharmaceutical, textile, chemical, biochemical, clinical industries and environmental analysis
Decrease of the intensities of the bands corresponding to the positions of various functional groups in reduced graphene oxide (rGO) indicates the successful reduction of GO to form rGO
These residual functional groups remained after the reduction of GO are beneficial in forming the composite between rGO and AgNPs
Summary
It is well known that hydrogen peroxide (H2O2) is an essential constituent in food, pharmaceutical, textile, chemical, biochemical, clinical industries and environmental analysis. It is formed in oxidase enzyme catalyzed reactions as a by-product. Numerous methods have been developed for the detection of H2O2, which includes titrimetry[7], fluorescence[8], electrochemiluminescence[9], spectrophotometry[10] and electrochemistry[11]. Among these reported methods, the electrochemical method has been widely used owing to its advantages such as accuracy, sensitivity, selectivity, low cost, high efficiency greener, fast and most importantly simple for field application[3, 12]. The silver nanoparticles (AgNPs) have gained much attention because of their excellent electrocatalytic activity in sensor applications[5, 20-26]
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