【摘要】 利用等离子体增强热丝化学气相沉积制备了碳纳米管,并用扫描电子显微镜和透射电子显微镜对生长的碳纳米管进行了表征。发现用CH4和H2制备的是空芯碳纳米管,而在反应气体中加入NH3后,生长的碳纳米管是竹节型结构的碳纳米管,表明氮在碳纳米管的结构变化过程中起到了重要的作用。根据氮对碳在催化剂中的扩散影响,分析了氮在碳纳米管结构发生变化过程中的作用。更多还原

【Abstract】 Carbon nanotubes were grown by plasma-enhanced hot filament chemical vapor deposition and they were characterized by scanning electron microscopy and transmission electron microscopy.It is found that the hollow carbon nanotubes were grown using methane and hydrogen as reaction gases,but the bamboo-structured carbon nanotubes were grown after ammonia was added into the reaction gases,indicating that nitrogen played important roles in the process of the structure change of carbon nanotubes.Acarding to the effects of nitrogen on diffusion of carbon in catalyst,the effects of nitrogen in the process of the structure change of carbon nanotubes are analyzed.更多还原