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首页> 外文期刊>RSC Advances >Electrochemical sensing of dopamine at the surface of a dopamine grafted graphene oxide/poly(methylene blue) composite modified electrode
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Electrochemical sensing of dopamine at the surface of a dopamine grafted graphene oxide/poly(methylene blue) composite modified electrode

机译：多巴胺接枝石墨烯氧化物/聚（亚甲基蓝）复合电极表面的多巴胺电化学感应

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摘要

The simultaneous electrochemical reduction of graphene oxide (GO) and oxidative polymerization of methylene blue yielding a polymer composite on a glassy carbon electrode surface is demonstrated. The stability of the reduced graphene oxide (ERG)/poly(methylene blue) (PMB) composite in buffer solution is also studied in detail. Interestingly, methylene blue initially forms a radical cation, which donates an electron to GO, then GO undergoes reduction and during the subsequent cycles, it forms the polymer composite through covalent interactions between simultaneously reduced GO and oxidized methylene blue. The formation of the polymer composite is characterized using electrochemical impedance spectroscopy, laser Raman spectroscopy, SEM and UV-Visible absorption studies. Dopamine is a neurotransmitter with primary amine and phenolic functional groups. The electrografting of dopamine onto an ERG/PMB composite modified electrode is carried out and is evaluated by FT-IR and XPS studies and the electrochemical stability of the grafted dopamine is demonstrated using CV studies. Differential pulse voltammetry studies reveal that the modified electrode shows a high selectivity and sensitivity towards the detection of dopamine in the presence of ascorbic acid (AA) and uric acid (UA) with a detection limit of 1.03 x 10(-6) mol L-1 from a calibration curve with a linear range of 0.96 x 10(-6) mol L-1 to 7.68 x 10(-6) mol L-1. Hence, this dopamine grafted on polymer composite modified electrode provides an attractive platform for the selective sensing of dopamine in the presence of interferents.
机译：甲基蓝石墨烯（GO）和氧化聚合的同时电化学还原在玻璃电极表面上产生聚合物复合物的亚甲基蓝色。还详细研究了缓冲溶液中的还原氧化物氧化物（ERG）/聚（亚甲基）/聚（亚甲基）复合材料的稳定性。有趣的是，亚甲基蓝初始形成自由基阳离子，该阳离子将电子赋予，然后在随后的循环中进行降低，通过同时还原和氧化亚甲基蓝之间的共价相互作用形成聚合物复合物。聚合物复合材料的形成配合使用电化学阻抗谱，激光拉曼光谱，SEM和UV可见吸收研究。多巴胺是具有伯胺和酚醛官能团的神经递质。进行多巴胺在ERG / PMB复合改性电极上的电解并通过FT-IR和XPS研究评估，使用CV研究证明接枝多巴胺的电化学稳定性。差分脉冲伏安法研究表明，修饰的电极显示出在抗坏血酸（AA）和尿酸（UA）存在下检测多巴胺的高选择性和敏感性，检测限为1.03×10（-6）摩尔L- 1从校准曲线，线性范围为0.96×10（-6）摩尔1至7.68×10（-6）Mol L-1。因此，将该多巴胺接枝在聚合物复合改性电极上为干涉剂的存在提供了一种有吸引力的平台，用于选择性的多巴胺。

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  • 来源
    《RSC Advances》 |2016年第24期|共10页
  • 作者

    Gorle Demudu Babu; Kulandainathan Manickam Anbu;

  • 作者单位

    Cent Electrochem Res Inst CSIR Electrochem Proc Engn Div Karaikkudi Tamil Nadu India;

    Cent Electrochem Res Inst CSIR Electrochem Proc Engn Div Karaikkudi Tamil Nadu India;

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  • 正文语种 eng
  • 中图分类 化学;
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