This presentation talks about the carbon nano tubes technology.A nanotube is a nanometer-scale tube-like structure which helps in developing a strong and intuitive structures for future and possible uses

1. A Presentation
on
CARBON
NANOTUBES

2. What is CARBON NANOTUBE
?
CARBON NANOTUBES (CNTs) are allotropes *
.of carbon with a cylindrical nanostructure
NANOTBES have been constructed with
length-to-diameter ratio of up to
. 132,000,000:1
*

3. Structure of CNTs

4. Types of CARBON NANOTUBES
: Single-Walled CNTs (1
Most SWNTs have a diameter of close
to 1nm , with a tube length that can be
.many millions of times longer
The structure of a SWNT can be
conceptualized by wrapping a
one-atom-thick layer of graphite
.called GRAPHENE
*
*

5. Single-walled CNT

6. : Multi-walled Nanotubes (2
.
MWNTs consist of multiple rolled layers
(concentric tubes) of graphite *
:Structure Model
Russian Doll
Parchment
Model *
Model *

7. Multi-walled CNTs

8. Synthesis of CNTs
. Arc Discharge : Nanotubes were
observed in 1991 in the carbon soot of
graphite electrodes during an arc
discharge , by using a current of 100 A (1

9. :Laser Ablation( 2
Process developed by Dr.Richard Smalley *
A pulsed laser vaporizes a graphite
*
target in a high temperature reactor
while an inert gas is bled into the
.chember
.Produces mainly SWNT *

10. :(Chemical Vapor Deposition (CVD( 3
.Common method for the commercial
production of CNTs *
.A substrate and two gases are used *
chemical vapor deposition Nanotubes being grown by

11. Properties of CNT
:Strength( 1
Strongest and Stiffest material
Tensile strength of 63 GPa
(6300 kg/mm sq.)
Hardness :
*
*
2)
* Graphite tranforms into DIAMOND
under condition of high temperature
and high pressure

12. Electrical :
thermal conductor
Propagate only along
* Current density 4*10^9 A/cm sq.
* thermal conductivity 3500 W/(m*K)
tube’s axis
4) Thermal :
5) One Dimensional Transport :
* very good( 3
* Electrons

13. Application of CNTs
In Electrical Circuits
As Paper Batteries
In Solar Cells (3
In Ultracapacitor (4
structural application (5
2) (1

14. In DNA detection (6
In High-reliability touchscreen
8) Nanoradio
As a Flywheel (9
In Fuel Cells (10
(7

15. Advantages Of CNT
Incredible Mobilities (1
Bandgap tunability (2
Processability (3
Low Schottky Barriers (4

16. Disadvantages of CNT
Very Expensive to produce *
Around $1500 per gram *

17. Thank you