Double coaxial structure and dual physicochemical properties of carbon nanotubes composed of stacked nitrogen-doped and undoped multiwalls
Double coaxial structure and dual physicochemical properties of carbon nanotubes composed of stacked nitrogen-doped and undoped multiwalls
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DOI：
10.1021/cm047830m
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发表时间：
2005-04
影响因子：
8.6
通讯作者：
Quan-hong Yang;Wei-hua Xu;A. Tomita;T. Kyotani
中科院分区：
文献类型：
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作者：
Quan-hong Yang;Wei-hua Xu;A. Tomita;T. Kyotani
以多孔阳极氧化铝薄膜为模板，采用模板法制备了双同轴结构的掺氮和未掺杂多壁碳纳米管。双同轴碳纳米管的内碳层(或外碳层)不含N，而外碳层(或内碳层)均匀掺杂N。透射电子显微镜无法区分内外两层，但拉曼光谱、X射线衍射和X射线光电子能谱的结果表明，掺N层的结晶程度低于未掺杂的碳纳米管。此外，由于氮物种的引入导致了更多的边缘活性中心，氮掺杂的层对氧的化学反应活性明显高于未掺杂的层。电导测量表明，尽管结晶度较差，但掺N层比未掺杂层具有更高的电导率。由此产生的多壁碳纳米管。
Carbon nanotubes with a double coaxial structure of nitrogen-doped and undoped multiwalls were successfully 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 from N, while the outer carbon layer (or the inner carbon layer) is uniformly doped with N. Transmission electron 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 less crystallized than the undoped one. Furthermore, the N-doped layer has apparently higher chemical reactivity toward oxygen than the undoped one due to more edge-active sites resulting from the introduction of nitrogen species. Electrical conductance measurement indicates that despite poorer crystallinity the N-doped layer has higher conductivity than undoped one. The resulting multiwalled carbon nanotubes ...