A solid-state hybrid method to synthesize straight carbon nanotubes by pyrolysis of two mixed metal phthalocyanines

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 °C. 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, 200̃800 nm in length) are quite straight and well-graphitized with nearly no defects. Two kinds of mixed transition metal phthalocyanines(M(Π)Pc, M=Fe, Co) were used as carbon source to obtain uniform catalysts 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.