以甲烷为碳源,Fe2O3为催化剂,常压下利用配有扰流器件(石墨碗)的约束型热等离子射流高温裂解甲烷,通过原位催化制得两类碳纳米管.运用SEM、TEM、TGA等对不同取样位置产物进行形貌和结构的表征.结果表明:在不同取样部位可获得不同形貌结构的碳纳米管.过滤管外壁处产物为单壁管,石墨碗内产物为套杯状多壁管.气体流动状态影响碳纳米管的形貌,经历层流的前驱物成为高度结晶单壁管,而经历湍流的前驱物则演变成套杯状多壁管.石墨碗腔内的局部高温可使多壁管不断增粗,有利于制备高纯度的碳纳米管.
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