Preparation of conductive polyaniline hydrogels co‐doped with hydrochloric acid/phytic acid and their application in Ag NPs@PA/GCE biosensor for H2O2 detection

Abstract

AbstractAccurate measurement of hydrogen peroxide is of great significance in monitoring human diseases and environmental safety. At present, there are a variety of testing methods, among which the use of electrochemical sensors to accurately measure hydrogen peroxide has gradually become a research hotspot. In this article, phytic acid (PA) with dual functions of doping and cross‐linking and HCl with strong ionization capacity was introduced as dopants to co‐doping polyaniline, and polyaniline hydrogel with a three‐dimensional network structure was prepared. The influence of the HCl/PA co‐doping ratio on conductive polyaniline hydrogel (CPAniH) was explored. The synthesis process and mechanism of HCl/PA‐CPAniH were analyzed and explained. In addition, the conductivity and mechanism of HCl/PA‐CPAniH, as well as the hydrogel characteristics were characterized and studied. A new electrochemical sensor based on polyaniline hydrogel and silver nanoparticles was constructed to detect hydrogen peroxide. The sensor has a good linear relationship, a wide linear range, and a high‐detection limit for H2O2. In addition, it also shows that HCl/PA‐CPAniH is a good interface material for electrochemical sensors and has a certain application potential.