چكيده به لاتين
In this study, graphene oxide was electrochemically deposited and reduced on a graphite plate electrode and the performance of the modified electrode in the detection of dopamine was investigated. The results show that the addition of reduced graphene oxide to the electrode surface increases the current peak, reduces the peak potential, and reduces the charge transfer resistance. The efficiency of dopamine detection by this modified electrode was evaluated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), linear scanning voltammetry (LSV), and electrochemical impedance spectroscopy (EIS). The effect of electrolyte pH, potential scanning speed, perturbation effect, electrode reproducibility, and repeatability was investigated. Also, for the stability test, the chronoamperometry (CA) technique was used which the results showed that the electrode has high stability. Dopamine ampoules were used to evaluate the diagnosis of the real sample. The structure and morphology of the electrode surface were studied by scanning electron microscopy (SEM). The detection limit of this electrode was 68 nM and the linear (concentration) range was 10-7 to10-4 M. This modified electrode is very cheap and economical and the mass production takes place in a short time.
