Electrochemical sensor formed from poly(3,4-ethylenedioxyselenophene) and nitrogen-doped graphene composite for dopamine detection

• Published in: RSC advances 2021-11, Vol.11 (59), p.37544-37551
• Main Authors: Kadir, Aygul, Jamal, Ruxangul, Abdiryim, Tursun, Sawut, Nurbiya, Che, Yuzhu, Helil, Zulpikar, Zhang, Hujun
• Format: Article
• Language: English
• Subjects: Chemical sensors; Chemistry; Composite materials; Conjugation; Dopamine; Electrochemical analysis; Graphene; Morphology; Nitrogen; Sensitivity enhancement; Voltammetry; X ray photoelectron spectroscopy
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d1ra07024j

In this study, an electrochemical sensor for dopamine (DA) detection has been developed by a composite of poly(3,4-ethylenedioxyselenophene) (PEDOS) and nitrogen-doped graphene (PEDOS/N-Gr) using an in situ polymerization method. Its structure and properties were then compared with those of the composites of poly(3,4-ethylenedioxythiophene) (PEDOT)/nitrogen-doped graphene (PEDOT/N-Gr), which were prepared by the same methods. FT-IR, Raman, UV-vis, XPS, mapping and SEM investigated the structure and morphology of these composites. These revealed that PEDOS/N-Gr had a higher conjugation degree than PEDOT/N-Gr. The synergetic effect between PEDOS and N-Gr was beneficial for the formation of a homogenous surface coating. The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods were conducted for electrochemical detection of DA. Compared with PEDOT/N-Gr, the PEDOS/N-Gr displayed an enhanced sensitivity and electrocatalytic performance for DA detection with linear ranges of 0.008-80 μM (PEDOT/N-Gr: 0.04-70 μM) and limits of detection (LOD) of 0.0066 μM (S/N = 3) (PEDOT/N-Gr: 0.018 μM (S/N = 3)). An electrochemical sensor for dopamine detection has been fabricated using a composite of PEDOS and N-Gr. The results of actual samples showed that the composite of PEDOS/N-Gr has excellent recovery (95.40-100.14%) for human serum and urine samples.