Nanosized Gadoliniumorthoferrite-based Electrochemical Sensor for the Determination of Dopamine

Abstract

This work deals with the synthesis, characterization of gadolinium ferrite nanoparticles, and its use as an electrochemical sensor for detection of dopamine. For the synthesis of gadolinium ferrite nanoparticles (GdFeO3 NPs), the combustion technique was employed using gadolinium oxide and ferric nitrate as precursor materials with sugar and ethanolamine as fuel. The size, shape and morphology of nanomaterials were determined by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The crystallite size of synthesized nanoparticles was found to be in the range of 40–45[Formula: see text]nm with a cubic crystal system. The electrochemical sensor, GdFeO3 NPs@graphite paste (GdFeO3/GP), was prepared by using synthesized nanomaterials and graphite powder by mixing in mortar in 1:4 ratio. cyclic voltammetry (CV) and Differential pulse voltammetry (DPV) techniques were employed to assess the electrochemical properties of the developed sensor. The result indicated that the developed sensor possessed better sensing ability, where minimum detection limit of dopamine at GdFeO3/GP electrode was 700[Formula: see text]nM with linearity range from 5[Formula: see text][Formula: see text]M to 160[Formula: see text][Formula: see text]M.