Unusual electrochemical response of ZnO nanowires-decorated multiwalled carbon nanotubes

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• 作者：Guang-Quan Mo ; Jian-Shan Ye ; Wei-De Zhang
• 关键词：Zinc oxide ; Nanowires ; Carbon nanotubes ; Electrochemical properties ; Biosensor
• 刊名：Electrochimica Acta
• 出版年：2009
• 出版时间：30 December 2009
• 年：2009
• 卷：55
• 期：2
• 页码：511-515
• 全文大小：704 K

文摘

A novel type of ZnO nanowires-modified multiwalled carbon nanotubes (MWCNTs) nanocomposite (ZnO-NWs/MWCNTs) has been prepared by a hydrothermal process. The ZnO-NWs/MWCNTs nanocomposite has a uniform surface distribution and large coverage of ZnO nanowires onto MWCNTs with 3D configuration, which was characterized by scanning electron microscopy. Cyclic voltammetry and electrochemical impedance spectroscopy methods were applied to investigate the electrochemical properties of ZnO-NWs/MWCNTs nanocomposite. Surprisingly, unlike the conventional n-type semiconducting ZnO nanowires grown on Ta substrate, the ZnO-NWs/MWCNTs nanocomposite exhibits excellent electron transfer capability and gives a pair of well-defined symmetric redox peaks towards ferricyanide probe. What's more, the ZnO-NWs/MWCNTs nanocomposite shows remarkable electrocatalytic activity (current response increased 4 folds at 0.3 V) towards H₂O₂ by comparing with bare MWCNTs. The ZnO-NWs/MWCNTs nanocomposite could find applications in novel biosensors and other electronic devices.