title: The effect of different temperature profiles upon the length and crystallinity of vertically-aligned multi-walled carbon nanotubes.
abstract: We synthesized vertically-aligned multi-walled carbon nanotubes with an inner diameter of 1.6-7.5 nm and stack height of 80-28600 microm by chemical vapor deposition. The effects of synthesis conditions such as substrate position in the tube furnace, maximum temperature, temperature increasing rate and synthesis duration on the structure of nanotubes were investigated. It was found that slightly faster temperature increase rate resulted in significantly longer length, larger diameter and more defects of nanotubes. Structural parameters such as inner, outer diameters, wall thickness and defects were investigated using transmission electron microscopy and Raman spectroscopy.
authors.affiliation: Department of Energy Science (DOES), Sungkyunkwan University, 300 Chunchun-Dong, Jangan-Gu, Suwon 440-746, Republic of Korea.
authors.forename: Jongju
authors.initials: J
authors.lastname: Yun
authors.forename: Cheesung
authors.initials: C
authors.lastname: Lee
authors.forename: Qing
authors.initials: Q
authors.lastname: Zheng
authors.forename: Seunghyun
authors.initials: S
authors.lastname: Baik