A promising electrochemical sensing platform based on ternary composite of polyaniline-Fe2O3-reduced graphene oxide for sensitive hydroquinone determination

摘要

Hydroquinone sensors have been shown useful for a range of applications from pharmaceutical and cosmetic industry, to environmental monitoring. In this paper, we report a facile synthesize polyaniline (PANi) nanofiber incorporated into iron oxide-reduced graphene oxide (Fe2O3-rGO) and its application to construct an electrochemical hydroquinone (HQ) sensor. The ternary composite material (PANi-Fe2O3-rGO) is characterized by means of field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and voltammetric techniques. The as-prepared ternary composite further employed as novel sensing material for fabricating the hydroquinone (HQ) sensor. Compared with bare PANi and binary composite (Fe2O3-rGO), the PANi-Fe2O3-rGO ternary composite showed enhanced electrocatalytic activity to HQ. oxidation. The oxidation current of HQ is linear to its concentration in the range of 1.0 × 10~(-7)-5.5 × 10~(-4) M and the detection limit is found to be 6.0 × 10~(-8) M. The obtained detection limit and linear range for PANi-Fe2O3-rG0 composite is very much comparable to the recent literature values. In addition, the fabricated sensor showed an excellent anti-interference ability against electroactive species and metal ions and proved to be useful for the estimation of the HQ in tab water with satisfactory recovery.