A Study on the Effects of Carrier Gases on the Structure and Morphology of Carbon Nanotubes Prepared by Pyrolysis of Ferrocene and C_2H_2 Mixture
A Study on the Effects of Carrier Gases on the Structure and Morphology of Carbon Nanotubes Prepared by Pyrolysis of Ferrocene and C_2H_2 Mixture作者机构:School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Department of Chemical and Materials Engineering Arizona State University Tempe AZ 85287-6006 United States
出 版 物:《Journal of Natural Gas Chemistry》 (天然气化学杂志(英文版))
年 卷 期:2005年第14卷第3期
页 面:151-155页
学科分类:081702[工学-化学工艺] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0702[理学-物理学]
主 题:carbon nanotube ferrocene vertically aligned bamboo-like carrier gas growth model
摘 要:Carbon nanotubes (CNTs) were prepared using different carrier gases, with ferrocene as the catalyst precusor and acetylene as the carbon source. The effects of ammonia and nitrogen as carrier gases on the structure and morphology of CNTs were investigated. Transmission electron microscope (TEM), high-resolution electron microscope (HRTEM), scanning electron microscope (SEM) and X-ray diffraction (XRD) were employed to characterize the products and the catalyst. Experiment results show that the CNTs grown in N2 gas exhibited cylindrical and tubular structure, while a bamboo-like structure was observed for the CNTs grown in NH3 gas. Moreover, vertically aligned CNTs were obtained on an A12O3 disk when NH3 was used as the carrier gas. The carrier gas also exerted influence on the shape of the catalyst. Based on the theory of active centers of catalysis and combined with the particle shape of the catalyst, a growth model for the vertically aligned CNTs on the substrate is given.