Layer-by-layer assembled carbon nanotubes for selective determination of dopamine in the presence of ascorbic acid
Layer-by-layer assembled carbon nanotubes for selective determination of dopamine in the presence of ascorbic acid
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DOI：
10.1016/j.bios.2004.04.018
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发表时间：
2005-01-15
影响因子：
12.6
通讯作者：
Mao, LQ
中科院分区：
文献类型：
--
作者：
Zhang, MN;Gong, KP;Mao, LQ
基于带正电荷的聚二烯丙基二甲基氯化铵(PDDA)和带负电荷的多壁碳纳米管(MWNTs)的静电相互作用，采用逐层(LBL)方法在玻碳(GC)电极上均匀稳定地组装了多层膜。研究了组装的MWNT多层膜对抗坏血酸(AA)和多巴胺(DA)的电催化活性，并将其用于在AA存在下选择性测定DA。扫描电子显微镜(SEM)对碳纳米管薄膜的表征表明，组装后的碳纳米管在电极上几乎以小束或单纳米管的形式存在。组装碳纳米管电极的循环伏安结果表明，基于LBL法的碳纳米管多层膜组装策略很好地保留了多壁碳纳米管对AA和DA的电化学催化活性，为分析应用提供了一些特别吸引人的优点，如组装在衬底上的多壁碳纳米管以小束或单管的形式组装，组装后的多壁碳纳米管薄膜的均匀性和稳定性。这些特点使得组装的多壁碳纳米管相对有可能在AA存在的情况下选择性和灵敏地测定DA。(C)2004爱思唯尔B.V.保留所有权利。
Multilayer films of shortened multi-walled carbon nanotubes (MWNTs) are homogeneously and stably assembled on glassy carbon (GC) electrodes using layer-by-layer (LBL) method based on electrostatic interaction of positively charged poly(diallyldimethylammonium chloride) (PDDA) and negatively charged shortened MWNTs. The assembled MWNT multilayer films were studied with respect to the electrocatalytic activity toward ascorbic acid (AA) and dopamine (DA) and were further applied for selective determination of DA in the presence of AA. Scanning electron microscopy (SEM) used for characterization of MWNT films indicates that the assembled MWNTs are almost in a form of small bundles or single nanotubes on the electrodes. Cyclic voltammetric results with assembled MWNT electrode indicate that the strategy based on the LBL method for assembling the MWNT multilayer films on substrate well retains the electrochemical catalytic activity of the MWNTs toward AA and DA, offering some advantages particularly attractive for analytical applications, such as the form of MWNTs assembled on the substrate, i.e., small bundles or single tubes, homogeneity and stability of the as-assembled MWNT films. These features make the assembled MWNTs relatively potential for selective and sensitive determination of DA in the presence of AA. (C) 2004 Elsevier B.V. All rights reserved.