Fabrication of graphene oxide /Cadmium sulphide quantum dots electrochemical sensor for sensitive detection of dopamine and tyrosine

Abstract

Abstract The present study we report the fabrication of GO-CdS quantum dots modified on glassy carbon electrode (GO-CdS/GCE) and is applied to monitor the levels of dopamine and tyrosine using electrochemical signal enhancement. GO-CdS quantum dots were prepared by using ultrasonication method followed by hydrothermal synthesis in a facile approach. The prepared quantum dots were analyzed by XRD, SEM, Raman spectroscopy, XPS, TEM and pore size distribution methods. The fabricated sensor performance was investigated by Electrochemical impedance spectroscopy (EIS). Cyclic voltammetry(CV) and Chronoamperometric methods. The results showed excellent selectivity and sensitivity with limit of detection of dopamine was observed to be 24nM.