甲烷受控扩散火焰合成碳纳米管的实验研究  

Experimental research on synthesis of multi-walled carbon nanotubes by methane-air controlled-diffusing flame

作　　者：于溯源[1] 于晓丽[1] 杨小勇[1] 王捷[1] 叶萍[1] 张晓峰[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《热科学与技术》2007年第4期340-345,共6页Journal of Thermal Science and Technology

摘　　要：燃烧火焰法是合成碳纳米管的新方法,具有设备简单、容易实现等优点。以硝酸镍为催化剂,在甲烷-空气受控扩散火焰中合成了多壁碳纳米管,燃烧产物中还发现了碳纳米颗粒、碳纳米纤维和碳黑。实验结果表明,随着采样高度的增加,所合成的无定形多壁碳纳米管和富勒烯状碳纳米颗粒逐渐转变为石墨化程度较高的竹节形多壁碳纳米管和洋葱状碳纳米颗粒。分析表明,火焰温度、甲烷裂解产物以及催化剂种类等因素影响碳纳米管的形态和结构。Methane-air laminar controlled-diffusing flame was employed to study the synthesis of carbon nanotubes （CNTs）. Different morphologies of the multi-wall carbon nanotubes （MWNTs） and nanoparticles were observed in combustion products when nickel nitrate was used as catalyst. Amorphous MWCNTs and fullerenes-like carbon nanoparticles were found at the lower part of the flame. At elevated flame height, bamboo-like MWCNTs as well as onion-like nanoparticles existed. With the increasing of flame height, the wall of bamboo-like MWCNTs and carbon nanoparticles became thicker and denser; the tubes became longer and straighter and the shapes of nanoparticles were changed from polygon to sphere. Further analysis indicated that flame temperature, pyrolysis products of methane and catalyst type could affect the formation of different kinds of MWNTs.

关 键 词：多壁碳纳米管 燃烧火焰合成 甲烷-空气受控扩散火焰 

分 类 号：TQ127.1[化学工程—无机化工] TK16[动力工程及工程热物理—热能工程]