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Carbon Nanotubes

In: Computers and Technology

Submitted By abmanas12
Words 735
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Running Head: CARBON NANOTUBES 1

CARBON NANOTUBES

CARBON NANOTUBES 2

ABSTRACT

This paper talks about Carbon Nanotubes. It explores their Mechanical, Electrical and

Thermal properties. Carbon Nanotubes are basically allotropes of Carbon and have

nanostructure , which in turn is cylindrical in shape. These have proved to be a very

valuable invention and are increasingly finding usage in manufacturing of high quality

products owing to their properties like immense strength and unique electrical properties.

They are among the stiffest and strongest fibers known till date.

CARBON NANOTUBES 3

MECHANICAL PROPERTIES

Recent researches have time and again revealed that Nanotubes are and can be ultimate

High strength Fibers. They have extraordinarily high tensile strength and elastic modulus

which is one of the prime reason for the stiffness and strength that they possess. They

have generally been found to be flexible and stretchable and continue behaving so under

normal conditions.

Though, under excessive tensile strain, tubes undergo plastic deformation, which means

permanent deformation. Also, weak shear interactions between adjacent shells and tubes

lead in reduction in the effective strength of carbon nanotubes , specially, Multi-walled

nanotubes. Under pressure, nanotubes are weaker and tend to undergo buckling primarily

due to their hollow structures.

All said, future prospect of nanotubes looks bright as it is hoped to assist scientists in

manufacturing products, which are strong and have strength to undergo intense pressure.

Nanotube’s mechanical properties might fuel production of items, which eventually turn

out as boon for mankind.

Eventually, we reach at a conclusion that Carbon Nanotubes are strong and flexible fibers

which present great hope for future.

CARBON NANOTUBES 4

ELECTRICAL PROPERTIES

Electrical properties of carbon nanotubes have always amazed and interested the

scientist’s fraternity. Several high level researches have been done to accurately gauge

and identify the correct electrical properties of nanotubes. It is believed and somewhat

has been established that Carbon nanotubes are different as far as electrical properties

like Conductivity, resistivity, carrier mobility are concerned.

Structure of nanotubes strongly effects their electrical properties. Their Conductivity is a

function of their chirality, the degree of twists and their diameters. Tests have found out

that single walled carbon fibers are the most conductive carbon fibers known so far.

Results suggest that Carbon nanotubes have high carrier mobility’s values and hence can

be an excellent material for number of semiconductor applications, especially in High-

Speed transistors where mobility is very important.

A very interesting property of carbon nanotubes is that their electrical resistivity changes

very quickly when other molecules attach them to the carbon atoms. This property

combined with the inherent property of low electrical resistance of carbon nanotubes

might do wonders and may result in major breakthroughs in scientific arena.

It has recently been revealed that single-walled can route electrical signals at speed up to

10 GHz .

These properties of carbon nanotubes are being exploited to develop next generation

electrical solutions for high-speed communication , which are energy efficient too.
CARBON NANOTUBES 5

THERMAL PROPERTIES

Carbon nanotubes are considered extremely fine thermal conductors. They exhibit a

property called ‘Ballistic Conduction’, which finds its origin in the extremely powerful

conducting capabilities of carbon nanotubes. Tests have revealed their thermal conductivity

around 9-10 times more than the thermal conductivity of copper, a metal indeed known

for its good thermal conductivity.

This record-setting anisotropic thermal conductivity of carbon nanotubes is enabling

applications where heat needs to move from one place to another. This , quite evidently,

also supports the long held view that carbon nanotubes are very good conductors of

heat. Theoretical work predicts that carbon nanotubes have room-temperature thermal

conductivity larger than graphite and diamond.

The Thermal conductivity for carbon nanotubes is found to increase and then decrease

with the tube elongation from an axially compressed state to a stretched state. It has

been proved that radial phonon modes, especially the high-frequency modes play a

dominant role in heat conduction mechanism of carbon nanotubes.

Owing to these thermal properties , carbon nanotubes are used in variety of fuel cell

components. They have proved to be outstanding material for super capacitor electrodes (

primarily due to their thermal properties).

CARBON NANOTUBES 6

REFERENCES

1) http://www.azonano.com/article.aspx?ArticleID=1564

2) http://www.understandingnano.com/nanotubes-carbon.html

3) http://www.nanowerk.com/spotlight/spotid=8797.php

4) http://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubes

5) http://iopscience.iop.org/0957-4484/11/2/305

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