Nanocomposite of functional multiwall carbon nanotubes with nafion, nano platinum, and nano biosensing film for simultaneous determination of ascorbic acid, epinephrine, and uric acid
Nanocomposite of functional multiwall carbon nanotubes with nafion, nano platinum, and nano biosensing film for simultaneous determination of ascorbic acid, epinephrine, and uric acid
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DOI：
10.1016/j.ab.2007.02.034
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发表时间：
2007-06-01
影响因子：
2.9
通讯作者：
Chen, Shen-Ming
中科院分区：
文献类型：
--
作者：
Yogeswaran, Umasankar;Thiagarajan, Soundappan;Chen, Shen-Ming
采用恒电位法制备了一种独特的纳米铂（Pt）和纳米金（Au）结合功能化多壁碳纳米管（f-MWCNTs-NF- ptau）复合膜。该复合膜对生化化合物混合物的氧化和同时测定pH为6.75的缓冲水溶液中抗坏血酸阴离子、肾上腺素和尿酸阴离子具有良好的催化活性。采用循环伏安法（CV）和差分脉冲伏安法（DPV）对复合膜修饰电极的神经递质电分析特性进行了测定。抗坏血酸、肾上腺素和尿酸阴离子的伏安峰分别为0.222和0.131 V。该复合膜还可以在金电极和透明半导体氧化铟锡电极上制备，用于不同种类的研究；如电化学石英晶体微天平（EQCM），扫描电子显微镜（SEM）和原子力显微镜（AFM）。通过EQCM技术揭示了Pt和Au在f-MWCNTs-NF上的结合，并利用SEM、AFM和扫描电化学显微镜（SECM）技术研究了膜的形貌。此外，利用SECM进行了广泛的研究，以获得复合膜修饰电极的表面电流形貌图像，这些图像表明电极上存在f-MWCNTs-NF-PtAu复合膜。(c) 2007爱思唯尔公司版权所有。
A unique bimetallic, nano platinum (Pt) with nano gold (Au) on nation (NF) incorporated with functionalized multiwall carbon nanotubes (f-MWCNTs) composite film (f-MWCNTs-NF-PtAu) was developed by the potentiostatic method. The composite film exhibits promising efficient catalytic activity towards the oxidation of mixture of biochemical compounds and simultaneous measurement of ascorbate anion, epinephrine and urate anion in aqueous buffer solution (pH 6.75). Both, the cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used for the measurement of electroanalytical properties of neurotransmitters by means of composite film modified electrodes. Well-separated voltammetric peaks were obtained for ascorbate, epinephrine and urate anions with the peak separations of 0.222 and 0.131 V. The composite film can also be produced on gold and transparent semiconductor indium tin oxide electrodes for different kinds of studies; such as electrochemical quartz crystal microbalance (EQCM), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The incorporation of Pt and Au onto the f-MWCNTs-NF was revealed by the EQCM technique and the morphology of the film was studied using SEM, AFM and scanning electrochemical microscopy (SECM) techniques. Further, extensive studies were carried out using SECM for obtaining the surface current topographic images of composite film modified electrodes, and these indicated the presence of f-MWCNTs-NF-PtAu composite film on the electrode. (c) 2007 Elsevier Inc. All rights reserved.