碳纳米管阵列、捆束的三步升温工艺制备及其形貌与结构

使用结构简单的单温炉设备，通过三步升温热解二茂铁、三聚氰氨混合物方法，在二氧化硅、多晶陶瓷基底上分别合成了碳纳米管阵列、碳纳米管捆束.使用扫描电子显微镜、透射电子显微镜、电子能量损失谱和x射线光电子能谱对合成样品进行了结构和成分分析.结果显示：两种基底上合成的纳米管均为多壁纯碳管；生长于光滑二氧化硅表面的碳纳米管具有高度取向性和一致的外径，长度为10—40μm.碳纳米管采取催化剂顶端生长模式并展示出类杯状形貌；生长于粗糙多晶陶瓷表面的碳纳米管捆束随机取向，碳纳米管直径为15—80nm，长度在几百微米，展示 关键词： 碳纳米管 热解法 三步升温工艺

Fabrication, morphology and structure of carbon nanotube arrays and bundles fabricated by a three-step rising temperature procedure

In a simple-structured single-temperature furnace, a three-step rising temperature process has been used to fabricate carbon nanotube (CNT) arrays and carbon nanotube bundles by pyrolysis of ferrocene/melamine mixtures on silica and ceramic wafers, respectively. The structure and composition of the CNTs are investigated by scanning electron microscopy, transmission electron microscopy, x-ray photoelectron spectroscopy and electron energy-loss spectroscopy (EELS). EELS spectrum shows that CNTs grown on the two different kinds of substrates are pure carbon tubes. CNTs on smoothing silica wafer are highly orientated and have uniform outer diameters of about 22 nm and varying lengths from 10 to 40 μm. CNTs grow in top growth mode and exhibit the stacked-cup-like structures. CNT bundles on rough ceramics wafer are randomly orientated. They have varying outer diameters of 15—80nm and lengths up to one hundred of micrometers. They exhibit two types of shapes, bell-like and dome-like. The effect of substrate morphologies on the morphology and structure of CNTs has been discussed.