In this study, screen-printed carbon electrodes (SPCE) were modified with electrochemically reduced graphene oxide (ERGO) (SPCE/ERGO), then polythionine (PTH) film was formed on SPCE/ERGO by electropolymerization technique (SPCE/ERGO/PTH). The optimum number of cycles has been determined for the electropolymerization of PTH on SPCE/ERGO. Gold nanoparticles (AuNP) were formed on SPCE/ERGO/PTH electrodes by electrodeposition method and electrochemical characterizations of SPCE/ERGO/PTH/AuNP electrodes were made by cyclic voltammetry (CV). The electrocatalytic effects of ERGO, PTH and AuNP on the electrooxidation of dopamine (DA), nicotinamide adenine dinucleotide (NADH) and ascorbic acid (AA) were investigated, and PTH was observed to play a role as a mediator for three analytes. The anodic peak potentials of DA, NADH and AA shifted in the negative direction, and anodic peak currents increased due to the synergistic effect of ERGO, PTH and AuNP together. The diffusion coefficients (D) of DA, NADH and AA were calculated as 3.37×10−8, 7.79×10−9 and 1.51×10−8, respectively, and also the electron transfer coefficients (α) were calculated as 0.327, 0.701 and 0.373, respectively. The effect of pH on the electrooxidation of DA, NADH and AA was also examined, and it was observed that the anodic peak potentials for all three analytes decreased with increasing the pH.
: November 5, 2020
|APA||Bilgi Kamaç, M , Altun, M , Yılmaz, M . (2021). Dopamin, NADH ve Askorbik Asitin Elektroyükseltgenmesine Elektrokimyasal Olarak İndirgenmiş Grafen Oksit, Politiyonin ve Altın Nanopartiküllerin Etkisi . Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi , 8 (1) , 8-23 . DOI: 10.35193/bseufbd.822201|