摘要
以二茂铁为催化剂前驱体,C2H2为碳源,在NH3和N2气氛中在Al2O3多孔基体上化学气相沉积制备出了一致取向的碳纳米管阵列.采用拉曼散射、扫描电子显微镜、高分辨电子显微镜、X射线衍射和元素分析等技术对产物进行表征.实验结果表明,以NH3为载气时,所制备的碳纳米管为竹节形结构,并且有一定量的N掺杂在其中,其质量含量大约在3.46%,碳纳米管的石墨层间距在0.384nm左右,实验产物中有Fe3C和Fe2N或Fe3N的生成,NH3在催化剂表面的吸附导致催化剂的表面性质的改变以及N的掺杂使生成的碳纳米管结构有一些缺陷,石墨化程度有所降低.碳纳米管的管径随着反应温度的增加而增大.
Vertically aligned carbon nanotubes （CNTs） was prepared on porous Al2O3 substrate by the CVD method with ferrocene as catalyst precursor, acetylene as carbon source and NH3, N2 as carrier gases. Raman spectrum, scanning electron microscope （SEM）, high-resolution electron microscope （HRTEM）, X-ray diffraction （XRD） and elemental analysis were employed to characterize the materials. Experiment results showed that CNTs grown in NH3 were bamboo-shaped structure at 800℃, containing about 3.46% （mass） N element and had a space between graphitic layers about 0. 384 nm. Moreover, Fe3C and Fe2N or Fe3N compound were detected in the carbon product. Catalyst surface property changed as a result of the NH3 adsorption in Fe catalyst and adulteration of N in the CNTs made the CNTs show some crystal distortion and a low graphitic degree. CNTs diameter increased with reaction temperature.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第4期964-969,共6页
CIESC Journal
基金
国家自然科学基金项目(50228203
20476076)
长江学者奖励计划.~~
关键词
碳纳米管
乙炔
多孔基体
Fe3C
NH3
石墨化程度
竹节形
掺杂
carbon nanotube
acetylene
porous substrate
Fe3C
NH3
graphitic degree
bambooshaped structure
adulteration
