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首页> 外文期刊>Electroanalysis >Highly Selective and Sensitive Detection of Dopamine in the Presence of Excessive Ascorbic Acid Using Electrodes Modified with C-60-Functionalized Multiwalled Carbon Nanotube Films
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Highly Selective and Sensitive Detection of Dopamine in the Presence of Excessive Ascorbic Acid Using Electrodes Modified with C-60-Functionalized Multiwalled Carbon Nanotube Films

机译：使用C-60功能化多壁碳纳米管薄膜修饰的电极，在过量抗坏血酸存在下对多巴胺的高选择性和灵敏检测

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摘要

Electrochemical detection of dopamine (DA) in the presence of a large excess of ascorbic acid (AA) was investigated with a novel all-carbon nanocomposite film of C-60-MWCNTs (C-60-functionalized multi-walled carbon nanotubes) using a bare MWCNTs film as control. Although both films can selectively detect DA from AA by separating their oxidation potentials, the C-60-MWCNTs film shows special selectivity and good sensitivity for detecting DA. On one hand, the C-60-MWCNTs composite film shows a higher activity for DA oxidation with enhanced peak current. On the other hand, the C-60-MWCNTs composite film effectively suppresses the oxidation of AA. Remarkably, it is found that the oxidation current of DA is over 2 times higher than that of AA even when the concentration of AA is about 3 to 4 orders of magnitude higher than that of DA. This offers a tremendous advantage for the simple and clean detection of DA free of the interfering AA signal in a real assay. Cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectrometry are used to characterize the C-60-MWCNTs composite film. These novel properties are interpreted to arise from the facile electron transfer between C-60 and MWCNTs in the C-60-MWCNTs nanocomposite film.
机译：使用新型的C-60-MWCNTs全碳纳米复合膜（C-60官能化的多壁碳纳米管），研究了在大量过量的抗坏血酸（AA）存在下对多巴胺（DA）的电化学检测。裸露的MWCNTs薄膜作为对照。尽管两种膜都可以通过分离氧化电位来选择性地从AA中检测DA，但C-60-MWCNTs膜显示出特殊的选择性和良好的检测DA的灵敏度。一方面，C-60-MWCNTs复合膜显示出更高的DA氧化活性，且峰值电流增加。另一方面，C-60-MWCNTs复合膜有效地抑制了AA的氧化。显着地发现，即使当AA的浓度比DA的浓度高约3至4个数量级时，DA的氧化电流也比AA的高2倍以上。这为在真实测定中简单，干净地检测DA而不干扰AA信号提供了巨大优势。循环伏安法，差分脉冲伏安法和电化学阻抗谱法用于表征C-60-MWCNTs复合膜。这些新颖的性质被解释为源于C-60-MWCNTs纳米复合膜中C-60与MWCNT之间的便捷电子转移。

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