二组元酞菁固相混合法裂解合成直立碳纳米管(英文)

A Solid-state Hybrid Method to Synthesize Straight Carbon Nanotubes by Pyrolysis of Two Mixed Metal Phthalocyanines

通过向两种金属酞菁的混合物添加一定量的硫粉,在800～950℃裂解合成了大面积的直立碳纳米管。采用场发射扫描电镜(FE-SEM)、高分辨透射电镜(HRTEM)和拉曼光谱对产物进行了观察和表征,结果显示:所合成的碳纳米管(直径为15～35nm,长度为200～800nm)管身平直,具有很好的石墨化程度,且杂质很少。采用两种金属酞菁((M(Ⅱ)Pc,M=Fe,Co))进行混合裂解时,既可以提供碳源,而且可以产生相当均匀的催化剂颗粒,有利直立碳纳米管的沉积。这种将两种酞菁进行固相混合裂解的方法,相当安全高效,有利于大规模生产直立碳纳米管。

Straight carbon nanotubes （CNTs） were synthesized in large scale through thermal chemical vapor deposition（TCVD） by pyrolysis of two mixed metal phthalocyanines with a certain amount of sulfur at 800-950 ℃. The results by field emission scanning electron microscopy （FE-SEM）, high resolution transmission electron microscopy （HRTEM） and Raman spectroscopy （Raman） reveal that the as-synthesized CNTs （15 -35 nm in diameter, 200-800 nm in length） are quite straight and well-graphitized with nearly no defects. Two kinds of mixed transition metal phthalocyanines（M（Ⅱ）Pe, M=Fe, Co） were used as carbon source to obtain uniform eatalvsts favoring the growth of the straight CNTs. The solid-state hybrid method is quite safe and efficient for synthesis of straight carbon nanotubes in large scale.