Abstract

In the present work, we have developed a metal nanoparticle and polymer framework (MNPPF) on glassy
carbon electrode (GCE) using biosynthesized silver nanoparticles (AgNPs) and polyvinyl pyrolidone (PVP),
and investigated its redox and electron charge transfer behavior. The MNPPF is prepared on bare GCE by
drop casting a layer of PVP on bare GCE electrode followed by deposition of biosynthesized AgNPs over PVP
layer. The resulting GCE/PVP/AgNPs electrode is characterized using scanning electron microscopy and cyclic
voltammetry (CV). Further, the redox behavior of bare and modified GCE electrode is studied by CV technique
using 5 mM Fe(CN)6-3/-4 as electrochemical probe in phosphate buffered saline (pH 7.0). The modified electrode
showed better redox behavior compared to bare GCE electrode. The charge transfer process is studied by
electrochemical impedance spectroscopy (EIS) measurements. The EIS results indicate lower charge transfer
resistance (Rct) for the GCE/PVP/AgNPs electrode compared to bare GCE electrode which is attributed to good
conductive behavior of PVP and Ag. From this study, we conclude that the AgNPs and PVP-based MNPPF
developed on bare GCE exhibit excellent redox and electron transfer characteristics; hence, it can find potential
applications in sensors and electroanalytical instrumentation.