Carbon nanotubes are a kind of material with special chemical structure and
excellent physical properties, demonstrating great application prospects in the
fields of electronics, physics and chemistry. In this paper, some preparation
methods of single walled carbon nanotubes were reviewed, and the advantages
and disadvantages of these methods were discussed, and the newest methods
of single walled nanotubes productions were reviewed.
Carbon nanotubes CNTs used in the research fields
of mechanics, optics, electronics and biology, they
are theoretically distinct as a cylinder fabricated of
rolled up graphene sheet, where exist in with two
phases: single walled carbon nanotubes SWCNTs
and multi walled carbon nanotubes MWCNTs [1],
different types of tubules can be formed by rolled
grapheme sheet as shown in figure(1),where the
grapheme is wrapped represented by a pair of indices
(n,m) which is can be classified of CNTs as armchair
(n=m ), zigzag (m=0), or chiral (all others). Single
walled carbon nanotubes SWCNTs exhibit all three
structures armchair(n=m ), zigzag (m=0), or chiral
(n,m)) arrangements while multi walled carbon
nanotubes MWCNTs exhibit only(armchair or
zigzag)[2],they are directly effect on electrical
properties of
أ.م.د. نهى هادي جاسم | Assist.Prof.Dr. Nuha Hadi Jasim | 10384