▎ 摘　　要

Both nitrogen and sulfur dual doped graphene supported Fe2O3 (NSG-Fe2O3) have been prepared by hydrothermal methods and subsequently utilized for the electrochemical determination of dopamine (DA) in presence of ascorbic acid (AA). The NSG-Fe2O3 has been characterized via transmission electron microscopy (TEM) and X-ray photoelectron spectroscopic (XPS). The electrochemical detection of DA was measured through the cyclic voltammetry, differential pulse voltammetry, and amperometric techniques in a 0.1 M phosphate buffer solution (PBS) at pH 7.4. Interferences have been investigated in presence of AA, glucose, serotonin, N2H4, and uric acid. The NSG-Fe(2)O(3)has shown good analytical performance for DA with comparatively better sensitivity (29.1 mu A mM(-1)), long linear detection range (0.3-210 mu M) and detection limit (0.035 mu M) (S/N = 3). The catalytic rate constant for DA detection has been calculated as 9.6 x 10(4) M-1 s(-1) with a good diffusion coefficient of 3.5 x 10(-4) cm(2) s(-1). The electrooxidation of DA may enhances by fast proton acceptance and/or electron donation due to higher electron density for excess loan pair electron that provided from N and S dual-doped graphene sheets. (C) The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. All rights reserved.