CARBON
NANOTUBES
NANOTECNOLOGY
06/12/2021
▪ Nano particles
▪ Carbon nanotubes
▪ Types of carbon
nanotubes
▪ Applications of carbon
nanotubes
▪ Synthesized method of
carbon nanotubes
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NANOPARTICLES
The extremely small particles of any shape within the
range of 1nm-100nm is called nanoparticles
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CARBON NANOTUBES
Carbon nanotube is a planner sheet of graphite(called
graphene) rolled to form hollow cylindrical nanostructure
having dimension of diameter 0.4-2 nm and length in
micrometre
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HISTORY
Of Carbon Nanotubes
In 1991 a Japanese physicist, Sumio lijma,conduct an
experiment, taking two graphite rods as electrodes, sumio
applied a current across the rods. A spark arched between
them and with a cloud of carbon gas puffed into
existance,vaporising the tip of the anode rod as the carbon
settled on chamber walls it form a thin layer of black soot, a
new material appears have tinny single layers straws of
carbon this is said to be now carbon nanotubes.
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TYPES OF CARBON
NANOTUBES
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▪
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Single walled carbon nanotube SWNT
Multiwall carbon nanotubes
MWNT
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SWNT
Single walled carbon nanotube
SWNTs are sheets of
graphene that have been
rolled up to form a long
hollow tube, with walls a
single atom thick.
Have extremely high Youngs Moduli (Up to 1TPa) and tensile
strength (Up to 100 GPa) along the longitudinal axis.
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SWNT
Single walled carbon nanotube
The electrical properties of carbon nanotubes are dependent
upon the orientation of the lattice. The lattice orientation is given
by two parameters (n, m). There are typically three types of
nanotubes that can form, these are: the armchair (where n = m),
zig-zag (n=x, m=0), and chiral (n=x, m=y).
Carbon nanotubes can exhibit either
metallic properties or semiconducting
properties,
depending
upon
the
orientation of the lattice. Zig-zag and
armchair carbon nanotubes exhibit
metallic
properties,
whilst
chiral
nanotubes can be either metallic or
semiconducting depending upon the
difference between the n and m units.
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MWNT
Multi walled carbon nanotube
Multi-walled carbon nanotubes (MWCNTs) are a
special form of carbon nanotubes in which
multiple single-walled carbon nanotubes are
nested inside one another.
The number of nanotubes that are within a
MWCNT can vary - from as little as 3, to over 20.
At the same time the diameter of both the
internal nanotube and the external most
nanotube can vary - from 2nm for the innermost
tube, to over 50nm for the outer wall.
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APPLICATIONS OF
CARBON NANOTUBES
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▪
▪
▪
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Carbon nano computers
Carbon nano transistors
Space elevator
Artificial muscles
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SYNTHESIZED METHOD
OF CARBON NANOTUBES
▪ ARC DISCHARGE METHOD
▪ LASER ABLATION
▪ CHEMICAL VAPOUR DEPOSITION
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ARC DISCHARGE METHOD
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LASER ABLATION
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