Investigation of the electrochemical behavior of dopamine at electrodes modified with ferrocene-filled double-walled carbon nanotubes
Investigation of the electrochemical behavior of dopamine at electrodes modified with ferrocene-filled double-walled carbon nanotubes
复制标题
二茂铁填充双壁碳纳米管修饰电极上多巴胺的电化学行为研究
DOI：
10.1016/j.electacta.2011.12.083
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发表时间：
2012-02-29
影响因子：
6.6
通讯作者：
Shi, Zujin
中科院分区：
文献类型：
--
作者：
Cheng, Huiming;Qiu, Hanxun;Shi, Zujin
通过制备二茂铁填充双壁碳纳米管（Fc @ DWNTs）修饰玻碳电极（Fc @ DWNTs/GCE），研究了一类新型的内嵌功能化碳纳米材料--二茂铁填充双壁碳纳米管（Fc @DWNTs）的电化学性质.在LiClO 4水溶液中，观察到一对氧化还原峰，对应于表面限制的Fc（+）/Fc对，表明包封在DWNTs内的Fc分子保持其电化学活性。此外，由于DWNTs可以克服Fc从修饰电极中的浸出，因此Fc@DWNTs/GCE显示出良好的稳定性。多巴胺（DA）在Fc@DWNTs修饰电极的电催化氧化也得到了，表明封装的Fc分子可以作为良好的电子传递介质。此外，由于Fc@DWNTs的特殊结构，还观察到DA的氧化产物的直接电还原。基于Fc@DWNTs和一种阳离子交换膜Nation构建了DA电化学传感器，Nation对传感器的选择性起着关键作用。在大量过量的抗坏血酸（AA）存在下进行安培测量。基于S/N为3，发现检测限为0.3 μ M。(C)2011爱思唯尔有限公司保留所有权利。
Electrochemical properties of a new class of endohedral functionalized carbon nanomaterial, ferrocene-filled double-walled carbon nanotubes (Fc@DWNTs) have been investigated by preparing an Fc@DWNTs modified glassy carbon electrode (Fc@DWNTs/GCE). In an aqueous LiClO4 solution, one pair of redox peaks corresponding to the surface-confined Fc(+)/Fc couple was observed, suggesting that Fc molecules encapsulated inside DWNTs retain their electrochemical activity. Moreover, the Fc@DWNTs/GCE showed good stability because DWNTs could overcome the leaching of Fc from the modified electrode. Electrocatalytic oxidation of dopamine (DA) at the Fc@DWNTs modified electrodes was also obtained, indicating that encapsulated Fc molecules can serve as good electron-transfer mediators. In addition, due to the peculiar structure of Fc@DWNTs, direct electroreduction of oxidation product of DA was also observed. An electrochemical sensor for DA has been constructed based on Fc@DWNTs and a kind of cation exchange membrane, Nation, which played a key role in the selectivity of the sensor. Amperometric measurements were conducted in the presence of a large excess of ascorbic acid (AA). The limit of detection was found to be 0.3 mu M based on S/N of 3. (C) 2011 Elsevier Ltd. All rights reserved.