钴/氧化镁催化体系升温速率对单壁碳纳米管管径的调节作用

Diameter Tuning of Single-walled Carbon Nanotubes with Heating Rate Using a Co/MgO Catalyst

以钴(Co)、氧化镁(MgO)作催化剂和催化剂载体,采用化学气相沉积(CVD)法催化裂解甲烷气体制备单壁碳纳米管(SWNTs)。利用拉曼光谱、紫外-红外-近红外吸收光谱、透射电子显微镜、X射线衍射、扫描电子显微镜等手段对样品进行表征。结果表明,在Co/MgO催化体系下,通过改变升温速率可以调节产物中粗细管径(0.8～1.4nm)SWNTs的相对含量;同时还证实了在不同的升温速率下所得到MgO基体的晶体结构是相同的。

Using Co/MgO as catalyst, the single-walled carbon nanotubes （SWNTs） were synthesized from methane decomposition by chemical vapor deposition. The products were characterized by Raman spectroscopy, UV- visible-near infrared absorption spectrum, transmission electron microscopy, X-ray diffractometry, scanning electron microscopy. The results show that Co/MgO allows diameter tuning of SWNTs over a broad diameter range （0. 8--1.4 nm） by changing heating rate. Also, X-ray diffractometry analysis results show that the change in heating rate does not affect crystal structure of MgO.