Fabrication of a Novel Shaped Graphene/poly (Evan’s blue) Composite Chemical Sensor for the Electrocatalytic Boost up of Neurotransmitter (Dopamine): A Voltammetric Investigation

A facile, sensitive and selective electrochemical sensor was fabricated based on electropolymerization of Evan’s blue (Eb) (Poly(Eb)) on the carbon paste electrode (CPE) followed by drop casting of graphene (GR) onto the Poly(Eb)/CPE. The electrochemical behaviour of dopamine (DA) at the surface of GR/Poly(Eb)/CPE was studied. Moreover, the surface morphology of various types of modified electrodes was characterised by electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM). The proposed electrochemical sensor has successfully facilitated the simultaneous resolution of DA in presence of uric acid (UA) and folic acid (FA). A good linear relationship was observed for the detection of DA in the range between 5-110 μM, with the lower detection limit of 6.52 μM. The analytical application of GR/Poly(Eb)/CPE was also studied towards the detection of dopamine in real sample analysis with good recovery results