Double Coaxial Structure and Dual Physicochemical Properties of Carbon Nanotubes Composed of Stacked Nitrogen-Doped and Undoped Multiwalls

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• 作者：Quanhong Yang ; Weihua Xu ; Akira Tomita ; and Takashi Kyotani
• 刊名：Chemistry of Materials
• 出版年：2005
• 出版时间：May 31, 2005
• 年：2005
• 卷：17
• 期：11
• 页码：2940 - 2945
• 全文大小：450K
• 年卷期：v.17,no.11(May 31, 2005)
• ISSN：1520-5002

文摘

Carbon nanotubes with a double coaxial structure of nitrogen-doped and undoped multiwalls weresuccessfully prepared by the template technique using porous anodic aluminum oxide film as a template.The inner carbon layer (or the outer carbon layer) of the double coaxial carbon nanotubes is free fromN, while the outer carbon layer (or the inner carbon layer) is uniformly doped with N. Transmissionelectron microscopy cannot differentiate between the outer and inner layers, but all the results by Raman,X-ray diffraction, and X-ray photoelectron spectroscopy provide evidence that the N-doped layer is lesscrystallized than the undoped one. Furthermore, the N-doped layer has apparently higher chemical reactivitytoward oxygen than the undoped one due to more edge-active sites resulting from the introduction ofnitrogen species. Electrical conductance measurement indicates that despite poorer crystallinity the N-dopedlayer has higher conductivity than undoped one. The resulting multiwalled carbon nanotubes thus havenot only double-stack coaxial structure but also dual physicochemical properties.