论文部分内容阅读
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.
A carbon nanotube array with uniform orientation was prepared by chemical vapor deposition of ferrocene as a catalyst precursor and C2H2 as a carbon source in NH3 and N2 atmospheres.Using Raman scattering and scanning electron microscopy Electron microscopy, X-ray diffraction and elemental analysis were used to characterize the product.The experimental results show that when NH3 is used as the carrier gas, the prepared carbon nanotubes have a bamboo-shaped structure and a certain amount of N is doped therein The mass content is about 3.46%, the graphite layer spacing of carbon nanotubes is about 0.384nm, Fe3C and Fe2N or Fe3N are formed in the experimental product, the adsorption of NH3 on the catalyst surface leads to the change of the surface property of the catalyst and the doping of N The resulting carbon nanotube structure has some defects and the degree of graphitization is decreased, and the diameter of the carbon nanotube increases with the increase of the reaction temperature.