摘要
在高温氮气氛以及铁、钴、镍的氧化物混合催化剂作用下,采用直流电弧放电法制备了具有不同形貌特征的外径超过100 nm的大直径碳管(LDCTs).透射电子显微镜(TEM)表征结果表明,LDCTs的外径为90~160 nm,内径为70~150 nm,管壁厚度为9~24 nm.高分辨透射电子显微镜(HRTEM)表征结果表明,LDCT的管壁内层为石墨层结构(平均厚度约为4~7 nm),外层为无定形碳结构(平均厚度约为4 nm),管壁间的隔层亦为石墨层结构.能量色散X射线(EDX)谱图和选区电子衍射(SAED)表征结果表明,LDCTs中掺杂有氮和过渡金属元素.初步探讨了LDCTs的生长机理.
Large diameter carbon tubes(LDCTs) with different morphologies were prepared by DC arc discharge under the conditions of mixed catalysts of iron,cobalt and nickel oxides,and nitrogen atmosphere of high temperature.Transmission electron microscope(TEM) investigation shows that the outer diameters of LDCTs are between 90—160 nm,the inner ones between 70—150 nm,and the thicknesses of their walls between 9—24 nm.High-resolution transmission electron microscope(HRTEM) investigation shows that the inner layers of LDCT walls are the graphite structure(average thickness 4—7 nm approximately),the outer ones consist of the amorphous carbon(average thickness 4 nm approximately),and the interlayers inside the LDCTs are also the graphite structure.Energy dispersive X-ray(EDX) spectroscope and selected area electron diffraction(SAED) studies reveal that the LDCTs are doped with nitrogen and transition metal elements.The growth mechanism of LDCTs is discussed primarily.
出处
《纳米技术与精密工程》
EI
CAS
CSCD
2009年第5期403-407,共5页
Nanotechnology and Precision Engineering
基金
教育部留学回国人员启动基金资助项目
天津市基础研究计划重点基金资助项目(05YFJZJC00200)
关键词
大直径碳管
电弧放电
氮气氛
过渡金属催化剂
large diameter carbon tubes
arc discharge
nitrogen atmosphere
transition metal catalysts
