Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, ROC.
Talanta. 2010 Jan 15;80(3):1094-101. doi: 10.1016/j.talanta.2009.08.034.
Conductive composite film which contains nafion (NF) doped multi-walled carbon nanotubes (MWCNTs) along with the incorporation of poly(malachite green) (PMG) has been synthesized on glassy carbon electrode (GCE), gold and indium tin oxide (ITO) electrodes by potentiostatic methods. The presence of MWCNTs in the composite film (MWCNTs-NF-PMG) enhances surface coverage concentration (Gamma) of PMG to approximately 396%, and increases the electron transfer rate constant (k(s)) to approximately 305%. Similarly, electrochemical quartz crystal microbalance study reveals the enhancement in the deposition of PMG at MWCNTs-NF film. The surface morphology of the composite film deposited on ITO electrode has been studied using scanning electron microscopy (SEM) and scanning tunneling microscopy (STM). These two techniques reveal that the PMG incorporated on MWCNTs-NF film. The MWCNTs-NF-PMG composite film also exhibits promising enhanced electrocatalytic activity towards the simple aliphatic alcohols such as methanol, ethanol and propanol. The electroanalytical responses of analytes at NF-PMG and MWCNTs-NF-PMG films were measured using both cyclic voltammetry (CV) and differential pulse voltammetry (DPV). From electroanalytical studies, well defined voltammetric peaks have been obtained at MWCNTs-NF-PMG composite film for methanol, ethanol and propanol at Epa=609, 614 and 602mV respectively. The sensitivity of MWCNTs-NF-PMG composite film towards methanol, ethanol and propanol in CV technique are 0.59, 0.36 and 0.92microAmM(-1)cm(-2) respectively, which are higher than NF-PMG film. Further, the sensitivity values obtained using DPV are higher than the values obtained using CV technique.
在玻碳电极（GCE）、金和铟锡氧化物（ITO）电极上，通过恒电位法合成了含有掺杂有全氟磺酸（NF）的多壁碳纳米管（MWCNTs）以及聚孔雀石绿（PMG）的导电复合膜。复合膜（MWCNTs-NF-PMG）中 MWCNTs 的存在将 PMG 的表面覆盖浓度（Gamma）提高到约 396%，并将电子转移速率常数（k(s)）提高到约 305%。同样，电化学石英晶体微天平研究表明，PMG 在 MWCNTs-NF 膜上的沉积得到了增强。使用扫描电子显微镜（SEM）和扫描隧道显微镜（STM）研究了沉积在 ITO 电极上的复合膜的表面形貌。这两种技术都表明 PMG 被掺入到 MWCNTs-NF 膜中。MWCNTs-NF-PMG 复合膜对甲醇、乙醇和丙醇等简单脂肪醇也表现出增强的电催化活性。使用循环伏安法（CV）和差分脉冲伏安法（DPV）测量了 NF-PMG 和 MWCNTs-NF-PMG 膜上分析物的电分析响应。从电分析研究中，在 MWCNTs-NF-PMG 复合膜上获得了甲醇、乙醇和丙醇的清晰伏安峰，其峰电位（Epa）分别为 609、614 和 602mV。MWCNTs-NF-PMG 复合膜对甲醇、乙醇和丙醇的 CV 技术的灵敏度分别为 0.59、0.36 和 0.92microAmM(-1)cm(-2)，高于 NF-PMG 膜。此外，使用 DPV 获得的灵敏度值高于使用 CV 技术获得的值。
