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CARBONNANOTUBES

STUDENT:IVAN ION-LIVIU

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WORLD OF NANO-TECHNOLOGY

A Nano-Particle defines a

small object that behaves

as a whole unit in terms of

transport and properties. Nanotechnology is in fact

a recasting of

straightforward materials

science.

Nanotechnology, is the study of the controlling of matter

on an atomic and molecular scale, dealing with structures of

the size 100 nanometers or smaller in at least one dimension.

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CARBON NANO TUBES

AND ITS ORIGINS

Carbon Nanotubes areallotropes of carbon witha cylindricalnanostructure.

In the 1970s, a preparationof the planned carbonfilaments was completedby Morinobu Endo.

In 1993 that Iijima and Donald Bethune found single walled

nanotubes known as Buckytubes. which are completely

hollow molecules that are crafted from pure carbon and are

bonded together in a pattern of specific hexagon patterns.

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TYPES OF NANOTUBES

SINGLE WALLED

NANO BUDS

MULTI WALLED

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PROPERTIES Carbon nanotubes are the strongest and stiffest materials

yet discovered in terms oftensile strength and elastic

modulus respectively. Tensile strength of63 gigapascals(GPa). Nanotubes are very good thermal conductors , exhibiting a

property known as Ballistic Conduction. The temperature stability of carbon nanotubes is estimated

to be up to 2800 C in vacuum and about 750 C in air.

Due to nanoscale dimensions, electrons propagate onlyalong the tube's axis. Hence, carbon nanotubes arefrequently referred to as One-Dimensional.

Multiwalled carbon nanotubes with interconnected innershells show Superconductivity with a relatively hightransition temperature Tc = 12 K.

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SYNTHESIS OF CARBON NANOTUBE

Carbon Nanotubes were observed during ARC-DISCHARGE

by using a current of100 amps. Graphite block is Vaporized

by high intensity Laser Pulse

in the presence ofInert Gases.CNTs form on cooler surface.

CNTs are formed on METAL

CATALYST (Ni, Fe, Co) in presence

ofAmmonia, Nitrogen, Hydrogen

with Acetylene, Ethylene, Ethanol

orMethane at 700 degree Celcius.

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APPLICATION IN ELECTRONICS &

ELECTRICAL DEVICE The joining of two carbon

Nanotubes with differentelectrical properties to form a

diode has been proposed.

CNT based Transistors work at

room temperature and are capable

of fast digital switching using a

Single Electron.

CNT based Ultra-Capacitors havehigh energy density, Capacitances up

to 5000 Farads can be achieved.

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APPLICATON OF CNT IN OTHER

FIELDS

CNT membranes support fluid flows

at several magnitudes greater than

proposed in Classical Fluid Dynamics.

Worlds Smallest motor.

The NANO MOTOR

CNT sponge can filterany toxic sludge

from water . As CNT sponge is

Hydrophobic, it absorbs everything but

water.

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FUTURE APPLICATIONS

CNT based BUCKY PAPERS are 250

times strongerthan steel and 10 times

lighter. Shows promise as vehicle &

personnelarmorand next-generation

electronics display.

May be used in Nano-Radio, sound canbe generated not by vibrations but by

Thermoacoustics Principle.

CNT can be used in SPACE-ELEVATOR as

it shows very high tensile strengths.

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THANK YOUTHE END