期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 873, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.114352
关键词
GO; Copolymer; Electrochemical sensor; Dopamine; Ascorbic acid
资金
- National Natural Science Foundation of China [21904050]
- Natural Science Foundation of Jiangsu Province, China [BK20190952]
- Open Fundation of State Key Laboratory of Life Analytical Chemistry, Nanjing University [SKLACLS1912]
- Talent Foundation of Jiangsu University of Science and Technology
In this paper, we fabricated a sensitive and stable ascorbic acid (AA) and dopamine (DA) amperometric biosensor using nanobiocomposite derived from poly(aniline-co-thionine) (P(ANI-co-THI)) modified graphene oxide (GO). A simple one-step electrochemical deposition method was used to deposit P(ANI-co-THI) on GO/GCE to prepare graphene oxide/poly(aniline-co-thionine) (GO/P(ANI-co-THI)) composite modified electrode. The GO/P(ANI-co-THI) nanocomposite was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and UV-Vis spectroscopy. The electrochemical performance was evaluated by differential pulse voltammetry (DPV) in 0.2 M PBS solution (pH = 7). The modified electrode displayed excellent electrocatalytic activity toward AA (typically at - 0.09 V vs. SCE) and DA (typically at 0.176 V vs. SCE) and the oxidation peak current of AA and DA increased to 2.9 and 2.6-times of that at GO/GCE, respectively. Response to DA was linear in the concentration range of 0.002 to 0.5 mM with a detection limit of 2 mu M. Response to AA was linear in the concentration range of 0.5 to 5 mM with a detection limit of 242 mu M. Furthermore, the GO/P(ANI-co-THI)-based electrochemical sensor also exhibited high selectivity, good reproducibility and stability,wide detection range and low detection line.
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