Determination of hydrogen peroxide on modified glassy carbon electrode by polytetrakis(2-aminophenyl)porphyrin nanowire

Abstract

Nanowires of polytetrakis(o-aminophenyl)porphyrin (PTAPPNW) were fabricated by electrochemical polymerization with the cyclic voltammetric method in anodic aluminum oxide (AAO) membranes. The glassy carbon electrode (GCE) modified by PTAPPNW, single-walled carbon nanotubes (SWNT) and Nafion as a binder was investigated with voltammetric methods in a phosphate buffer saline (PBS) solution at pH 7.4. The PTAPPNW × SWNT × Nafion/GCE exhibited strongly enhanced voltammetric and amperometric sensitivity towards hydrogen peroxide (H2O2), which shortened the response time and enhanced the sensitivity for H2O2 determination at an applied potential of 0.0 V by amperometric method. The PTAPPNW × SWNT × Nafion/GCE can be used to monitor H2O2 at very low concentrations in biological pH as an efficient electrochemical H2O2 sensor.