Open AccessSynthesis of carbon nanotubes using alumina template and its thermal annealing effects
Author(s) -
Sen Wang,
Yu Guo-Jun,
Jinlong Gong,
Dong Zhu,
He Suixia,
ZY Zhu,
Hongjie Xu
Publication year - 2005
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.54.4949
Subject(s) - materials science , annealing (glass) , crystallite , carbon nanotube , transmission electron microscopy , crystallization , graphite , scanning electron microscope , amorphous solid , chemical engineering , amorphous carbon , nanotechnology , composite material , crystallography , metallurgy , chemistry , engineering
Highly uniform multiwall carbon nanotubes (MWCNTs) were synthesized using templ ate confining growth technique in combination with high temperature annealing. Scanning electron microscopy (SEM) images show that the morphology and dimensi on of raw carbon nanotubes (CNTs) synthesized by template confining growth techn ique is completely controlled by the template structure. Transmission electron m icroscopy (TEM) and x-ray powder diffraction (XRD) studies reveal that the tube wall has a mixed structure of amorphous carbon and graphite nanocrystallites. To reduce crystallite defects and the content of amorphous carbon, a series of hig h temperature annealing (1100—2400℃) of the raw CNTs were carried out. In addi tion, the tube wall crystallization behavior under high temperature was prelimin arily studied. The experiment results show that high temperature annealing is an effective way to improve the quality of MWCNTs.