以 Hummers 方法制备的氧化石墨烯为前驱体,在乙二胺和水的混合溶剂热条件下(150℃,8h)合成了掺氮石墨烯(NG)。通过 XRD、FT-IR、XPS 和电化学阻抗谱研究了掺氮石墨烯的结构和电化学性能。结果表明,通过溶剂热反应在石墨烯表面引入C-N,N-H 等含氮基团。乙二胺不仅能对氧化石墨烯进行部分还原,而且还能对其进行掺氮功能修饰。电化学阻抗谱研究表明,掺氮石墨烯(NG)的电子转移阻抗明显小于相同条件下水热还原制备的石墨烯,说明功能修饰石墨烯大大改善了电子转移速率。将掺氮石墨烯修饰电极应用于对抗坏血酸的电化学检测,检出限达1.0×10-5~2.8×10-2 mol/L,最低检测限(3σ/slope)为1.7×10-7 mol/L。
N-doped graphene was synthesized by on-pot hydrothermal process in the mixed solution using ethyl-enediamine and graphene oxide (GO)as precursors.X-ray diffraction (XRD),Fourier transform infrared (FT-IR)spectra,X-ray photoelectron spectroscopy (XPS)and electrochemical impedance spectroscopy (EIS)were utilized to characterize structure and electrochemical behavior of the as synthesized N-doped graphene.The or-ganic amine is not only as reductant to remove the oxygen-containing groups (OCGs)in the graphene oxide,but also as nitrogen sources to obtained the N-doped graphene.The EIS revealed the electron transfer impedance of the N-doped graphene was obviously lower than graphene,indicating that the introduction of nitrogen-contai-ning groups remarkably improve the electrical conductivity.The obtained N-doped graphene was also applied to electrochemical determination of ascorbic acid.The detection limit was found to be 1.7 × 10-7 mol/L.This demonstrated the material was of excellent electrocatalytic property.
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