Citation: CAO Yong, JIAO Qing-Ze, ZHAO Yun. Synthesis of N-doped and Undoped Carbon Nanotubes on Fe/M Catalysts[J]. Acta Physico-Chimica Sinica, 2009, 25(11): 2380-2384. doi: 10.3866/PKU.WHXB20091121
Fe/M 催化合成碳纳米管和氮掺杂碳纳米管
以M 负载的Fe为催化剂、正己烷为碳源、乙二胺为氮源, 用催化化学气相沉积法合成了碳纳米管(CNTs)和氮掺杂碳纳米管(CNx). 通过还原焙烧的Mg/Fe水滑石(LDH)和Mg(NO3)2/Fe(NO3)3前驱体得到具有催化活性的Fe催化剂(Fe-LDH和Fe-Mg(NO3)2/Fe(NO3)3). 由这两种催化剂催化合成的CNTs都具有中空的管状结构. Fe-LDH催化合成的CNx具有明显的“竹节”状形貌, 而Fe-Mg(NO3)2/Fe(NO3)3催化合成的部分CNx的形貌与“竹节”状不同. 该CNx具有厚的管壁且在管壁的石墨层与层之间存在大量的空隙. Fe-LDH催化合成的CNx中氮摩尔分数为6.3%, 高于Fe-Mg(NO3)2/Fe(NO3)3催化合成CNx中的5.7%; 但后者具有更多的缺陷, 石墨化程度更加无序.
English
Synthesis of N-doped and Undoped Carbon Nanotubes on Fe/M Catalysts
N-doped and undoped carbon nanotubes (CNx and CNTs) were synthesized by the catalytic chemical vapor deposition of ethylenediamine and hexane on Fe/M catalysts. The Fe catalysts were obtained by calcination ofa Mg/Fe layered double hydroxide (LDH) and a mixture of Mg(NO3)2/Fe(NO3)3 precursors followed by reduction (Fe-LDH and Fe-Mg(NO3)2/Fe(NO3)3). The CNTs grown on both catalysts had tubular structures with hollow cores while some of the CNx grown on Fe-Mg(NO3)2/Fe(NO3)3 had a different morphology from the conventional bamboo-shape of those grown on Fe-LDH. This special morphology with thick walls had some space between the graphite layers. The molar content of N in the CNx grown on Fe-LDH was 6.3%, which was a little more than 5.7%found in the CNx grown on Fe-Mg(NO3)2/Fe(NO3)3. However, the latter has more defects and disorders.
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Key words:
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Carbon nanotube
- / N-doped carbon nanotube
- / Layered double hydroxide
- / Catalyst
- / Precursor
- / Chemical vapor deposition
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