Synthesis, characterization of green tea stabilized iron nanoparticles and their synergistic effect on polyaniline

Abstract

Journal article

This work reports the synthesis of polydisperse iron nanoparticles (FeNPs) stabilized on green tea polyphenol stabilizing and capping agents. An in –built template synthesis method was employed which requires no post –synthesis template removal. The green tea extracts at temperatures 25, 50, 75, 90 °c were used. The characteristics of the ‘green synthesis’ processed FeNPs were evaluated through UV-Vis spectroscopy, High Resolution Tunneling Microscopy (HRTEM), Electrochemical impedance spectroscopy (IES) and Cyclic voltammetry (CV). UV-Vis results indicated formation of the FeNPs peaks at 280 and 350 nm as the HRTEM results showed that the FeNPs were spherical and polydisperse with diameter ranges 50-200mm. The FeNPs were embedded (HRTEM results) on to the polyols which indicated their stabilizing and capping roles. Energy dispersive x-ray spectroscopy (EDX) revealed the FeNPs majorly constituted of iron. Electrochemical impedance spectroscopy (EIS) results indicated that the charge transfer resistance (Ra) of Pt-FeNPs modified electrode was lower (Ra=1.8905x106 Ω) compared to that of the bare Pt electrode (1.0982x107 Ω) indicating that the synthesized FeNPs have good conductivity. Analysis of the cyclic voltammograms for the P√ FeNPs and P√PANi (polyaniline) led to the calculation of the corresponding kineti parameters