论文标题
化学蒸气沉积对部分填充的碳纳米管催化生长的预热作用
Pre-heating effect on the catalytic growth of partially filled carbon nanotubes by chemical vapor deposition
论文作者
论文摘要
由于使用大气压化学蒸汽蒸气沉积（APCVD）合成的纳米管成核之前的高温加工而导致的FE催化剂膜的表面重建及其对部分填充的碳纳米管（CNT）的生长形态的影响。结果表明，催化剂膜的预热深刻影响粒度分布，该分布控制相应CNT的生长形态。通过原子力显微镜（AFM）在热处理之前和之后分析了催化剂颗粒在SI底物上的分布，这表明热处理会导致催化剂簇凝聚并形成宏观岛屿。生长材料的X射线衍射（XRD）模式表明它们本质上是石墨的。扫描电子显微镜（SEM）分析表明，生长密度在很大程度上取决于Fe催化剂膜的前热处理。通过高分辨率透射电子显微镜（HRTEM）测量观察到具有部分催化剂填充的多壁CNT。 CNT的石墨化程度也取决于拉曼分析所证明的前加热。提出了一个简单的用于部分催化剂填充纳米管的模型。
The surface reconstruction of the Fe catalyst films due to high temperature processing in hydrogen prior to nanotube nucleation and its effect on the growth morphologies of partially filled carbon nanotubes (CNTs) synthesized using atmospheric pressure chemical vapor deposition (APCVD) of propane was investigated. Results show that pre-heating of the catalyst film deeply influences the particle size distribution, which governs the growth morphologies of the corresponding CNTs. The distribution of the catalyst particles over the Si substrate was analyzed before and after the heat treatment by atomic force microscopy (AFM) which reveals that heat treatment causes clusters of catalyst to coalesce and form macroscopic islands. The X-ray diffraction (XRD) pattern of the grown material indicates that they are graphitic in nature. Scanning electron microscopy (SEM) analysis suggested that the growth density strongly depends on the pre heat treatment of the Fe catalyst film. Multiwalled CNTs with partial catalyst filling were observed via high-resolution transmission electron microscopy (HRTEM) measurements. The degree of graphitization of the CNTs also depends on the pre heating as demonstrated by Raman analysis. A simple model for the growth of partially catalyst filled nanotubes is proposed.
