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以乙醇为碳源在低气压条件下利用化学气相沉积(CVD)技术在多孔氧化铝模板中制备了碳纳米管阵列.扫描电子显微镜(SEM)和低分辨透射电子显微镜(TEM)成像结果表明,所得碳纳米管的外径和长度高度统一,完全受制于所制备的多孔氧化铝模板阵列纳米孔道.高分辨透射电子显微镜(HRTEM)成像表明,所得碳纳米管的管壁石墨化程度虽与自由生长的多壁碳纳米管管壁石墨化程度还有一定差距,但已明显高于目前文献所报道的此类碳纳米管.作为对比,在相同生长条件下使用乙炔作为碳源也得到了碳纳米管阵列,HRTEM成像结果和Raman光谱证明,其管壁的石墨化程度较前者要低得多.本文提出羟基自由基对无定形碳的刻蚀作用对碳纳米管管壁的石墨化有重要影响;另外,初步探讨了多孔氧化铝模板阵列纳米孔道的光滑程度对碳纳米管生长的影响.
Carbon nanotube arrays were prepared in a porous alumina template by chemical vapor deposition (CVD) at low pressure using ethanol as a carbon source. Scanning electron microscopy (SEM) and low-resolution transmission electron microscopy (TEM) The obtained carbon nanotubes were highly uniform in their outer diameter and length, and were totally confined to the prepared nanoporous alumina template array nanopore.High-resolution transmission electron microscopy (HRTEM) imaging showed that although the degree of graphitization of the resulting carbon nanotubes was the same as that of the free The extent of graphitization of the wall of the growing multi-walled carbon nanotube is still somewhat different, but it is significantly higher than those reported in the current literature. In contrast, the use of acetylene as the carbon source under the same growth conditions also results in carbon The results of nanotube array, HRTEM imaging and Raman spectroscopy show that the graphitization degree of the tube wall is much lower than that of the former.It is suggested that the etching of amorphous carbon by hydroxyl radicals is important for the graphitization of CNT walls. In addition, the effects of the smoothness of nanopore of porous alumina template on the growth of carbon nanotubes were also discussed.