气相生长纳米碳纤维的形态控制

报道了在浮动催化系统中,催化剂、促进剂以及苯/氢气比例等因素对气相生长纳米碳纤维形态的决定性作用和不同结构形态纳米碳纤维的选择生长.利用控制催化剂前体和促进剂的含量以及苯与氢气的比例等因素,制备了平直碳纳米管、弯曲碳纳米管、碳珠/纳米碳纤维、纳米碳纤维等不同结构的气相生长纳米碳纤维.实验结果表明,在浮动催化系统中,调节催化剂和促进剂的含量以及苯与氢气的摩尔比等关键性因素可以实现对气相生长纳米碳纤维形态结构的控制.

Morphology Control of Vapor Grown Carbon Nanofibers

The influences of catalyst precursor, promoter and benzene to hydrogen mole ratio on the morphology of carbon filaments and selective preparation of carbon filaments by the float- ing catalyst method were reported. By controlling the contents of ferrocene (catalyst precursor), thiophene (promoter) and benzene to hydrogen mole ratio, straight carbon nanotubes (S-CNTs), curving carbon nanotubes (C-CNTs), beaded carbon nanofibers (B-CNF) and carbon nanofibers (CNF) were synthesized. Effects of different parameters, especially, critical role of catalyst, pro- moter and benzene to hydrogen mole ratio were discussed. From TEM, Raman spectroscopy, HRTEM and TG-DSC analysis, it can be concluded that controllable growth of carbon filaments with different morphologies can be realized in the floating catalyst system by simply coatrolling such parameters as catalyst, promoter and benzene to hydrogen mole ratio.