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火焰法制备螺旋碳纳米纤维及其生长机理研究

发表时间:2011-05-15  浏览量:1394  下载量:670
全部作者: 廖灵敏,潘春旭
作者单位: 武汉大学物理科学与技术学院
摘 要: 利用Ni为催化剂,在火焰法中用正丙胺、异丙胺、正丁胺取代乙醇作为燃料,制备出纳米级的螺旋实心碳纤维。采用场发射枪高分辨扫描电镜(field emission-scanning electron microscopy,FE-SEM)、透射电镜(transmission electron microscopy,TEM)和高分辨透射电镜(high-resolution transmission electron microscopy,HR-TEM)等对燃烧产物的形貌和结构进行表征。实验结果表明:当使用涂覆Ni(NO3)2为催化剂时,碳纳米纤维形态以绞绳状螺旋和弹簧形螺旋为主;而当使用电镀Ni纳米晶为催化剂时,碳纳米纤维则为非螺旋的平直纤维。机理分析认为:1) 绞绳状螺旋结构的形成是催化剂、燃料含碳量和燃烧热等共同作用的结果;2) 弹簧状螺旋结构的形成可能与不同胺燃料的分子链结构有关。螺旋碳纳米纤维表面产生的大量缺陷与胺燃料中含有氮元素有关。
关 键 词: 纳米材料;碳纳米纤维;火焰法;胺;螺旋
Title: Synthesis and growth mechanism of helical carbon nanofibers from amine flames
Author: LIAO Lingmin, PAN Chunxu
Organization: School of Physics and Technology, Wuhan University
Abstract: Three liquid amine fuels were used for growing carbon nanofibers (CNFs) from nickel catalyzers in flames. The morphologies and microstructures of the combustion products were characterized by using field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HR-TEM). It was found that rope-like helical CNFs of low pitch and spring-like nano-coils CNFs of high pitch were obtained when the nickel nitrate catalyst was used, while the straight filament-like CNFs were produced when the plated Ni nanocrystalline catalyst was used. The growth mechanism for the rope-like helical CNFs might be the combining effects of the catalyst particles, carbon content and combustion heat of the fuels. And the growth of the spring-like nano-coils was coarsely related with molecular chain structures for different amine fuels. In addition, many defective sites were observed upon the sidewall of the helical CNFs, which might be induced by the nitrogen element contained in the amine fuels.
Key words: nanometer materials; carbon nanofibers; flames; amine; helical
发表期数: 2011年5月第9期
引用格式: 廖灵敏,潘春旭. 火焰法制备螺旋碳纳米纤维及其生长机理研究[J]. 中国科技论文在线精品论文,2011,4(9):813-819.
 
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