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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical Response and Impedimetric Behaviour of Dopamine and Epinephrine at Platinum Electrode Modified with Carbon Nanotubes-Gold Nanocomposite
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Electrochemical Response and Impedimetric Behaviour of Dopamine and Epinephrine at Platinum Electrode Modified with Carbon Nanotubes-Gold Nanocomposite

机译：碳纳米管-金纳米复合物修饰的铂电极上多巴胺和肾上腺素的电化学响应及阻抗行为

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A Platinum (Pt) electrode was modified with gold and gold oxide nanoparticles electrodeposited onmulti-walled carbon nanotubes. The modified electrodes were characterised with techniques such asTransmission Emission Microscopy (TEM), Scanning Electron Microscopy (SEM), and EnergyDispersive X-ray Spectroscopy (EDX). The electrochemical properties were investigated using cyclicvoltammetry, square wave voltammetry and electrochemical impedance spectroscopy. The electrodeswere used as analytical probes towards the detection of dopamine (DA) and epinephrine (EP). Resultsshowed that Pt-MWCNT-Au electrode gave the best dopamine and epinephrine current response atlower charge transfer resistance Rct values of 9.1 and 9.4 m 2 in DA and EP respectively comparedwith other electrodes. The electrooxidation of the analyte involved adsorbed intermediates withadsorptive capacitance (Cads) and Tafel values of, 331.6 Fcm -2, 136.4 mVdec-1 in DA; and 225.2Fcm-2, 162.8 mVdec-1 in EP. The limit of detection were 786.5 nM and 35028.4 nM while thecatalytic rate constant (K) were (13.82.4) and (18.94.2) x 108 cm3 mol-1 s-1 for DA and EPrespectively on the electrode. The limit of detection is favourable for DA detection in biologicalsystem where DA exists in M concentration. The electrode was easy to prepare and was alsoelectrochemically stable such that it could be used for the detection of DA and EP in the presence ofinterfering species such as ascorbic acid (AA).
机译：用电沉积在多壁碳纳米管上的金和氧化金纳米粒子修饰铂（Pt）电极。修饰的电极用诸如透射发射显微镜（TEM），扫描电子显微镜（SEM）和能量分散X射线光谱（EDX）的技术表征。使用循环伏安法，方波伏安法和电化学阻抗谱研究了电化学性能。电极用作检测多巴胺（DA）和肾上腺素（EP）的分析探针。结果表明，与其他电极相比，Pt-MWCNT-Au电极在DA和EP的电荷转移电阻Rct值分别为9.1和9.4m2时表现出最好的多巴胺和肾上腺素电流响应。分析物的电氧化涉及被吸附的中间体，其吸附电容（Cads）和Tafel值在DA中为331.6 Fcm -2、136.4 mVdec-1。 EP中的225.2Fcm-2、162.8 mVdec-1。电极上DA和E的检测限分别为786.5 nM和35028.4 nM，而催化速率常数（K）分别为（13.82.4）和（18.94.2）x 108 cm3 mol-1 s-1。检测极限对于在M浓度存在DA的生物系统中的DA检测是有利的。该电极易于制备，并且电化学性质也很稳定，因此可以在存在抗坏血酸（AA）等干扰物质的情况下用于检测DA和EP。

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