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

Aygul Kadir; Ruxangul Jamal; Tursun Abdiryim; Nurbiya Sawut; Yuzhu Che; Zulpikar Helil; Hujun Zhang

doi:10.1039/d1ra07024j

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

RSC Adv. 2021 Nov 22;11(59):37544-37551. doi: 10.1039/d1ra07024j. eCollection 2021 Nov 17.

Authors

Aygul Kadir^{1

2}, Ruxangul Jamal², Tursun Abdiryim¹, Nurbiya Sawut¹, Yuzhu Che¹, Zulpikar Helil¹, Hujun Zhang¹

Affiliations

¹ Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Institute of Applied Chemistry, College of Chemistry, Xinjiang University Urumqi 830046 Xinjiang PR China tursunabdir@sina.com.cn.
² Key Laboratory of Petroleum and Gas Fine Chemicals, Ministry of Education, College of Chemical Engineering, Xinjiang University Urumqi 830046 Xinjiang PR China jruxangul@sina.com.

Abstract

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)).