not but it can be seen

1. EXCITING FUTURE OF CARBON
NANOTUBES

2. What Are They?
•Allotropes of carbon
with a cylindrical
structure
•Can be capped on the
ends with buckyballs or
open ended
•Composed entirely of sp2
bonds

3. Why Should We Care?
• Strong like a steel
• Light as a aluminum
• Elastic like Plastic
• Excellent Chemical and
thermal Stability
• Rich electronic properties

4. CNT
Two types of CNTs
multi walled
make incredibly strong fibers
single walled
well suited for electrical and thermal conduction
the strength of a MWNT is ten times higher than any other known
fiber!

5. PROPERTIES
Single Walled CNT Multi Walled CNT
Length Less than 100nm up to several cm
Diameter .8-2nm 5-20nm
L/D 100- 4x10^7 20-2x10^6
Thermal Conductivity 3500 W/mK
(>diamond)
-
Tensile Strength - 100 Gpa

6. Synthesis of CNTs
 Arc discharge
 CNTs Can be found in the carbon soot of graphite electrodes during
an arc discharge involving high current. This process yields CNTs with
lengths up to 50 microns.

7.  Laser Ablation
 In the laser ablation process, a pulsed laser vaporizes a
graphite target in a high-temperature reactor while an inert gas
is inserted into the reactor. Nanotubes develop on the cooler
surfaces of the reactor as the vaporized carbon condenses.
 Other methods where CNTs are created:
 - Chemical Vapor Decomposition
 - Natural, incidental, and controlled flame environments

8. Emerging application
• Transparent electrodes
• Lithium batteries
• Super capacitors
• CNT based electronic
components such as
field effect transistor
• Coating and films etc.

9. Demand of CNTs in various industries

10. Product opportunity of CNTs
• Solar heat electric generation
• Power cables
• Silicon replacement in semiconductor circuit
• Aircraft body material
• Wind power generator fan blade
• Nanomachines- CNT based nanogear with
benzene molecule bonded as teeth.

11. Challenges and potential
 Potentials :
– the new wonder material, can useful in many types of industry
,especially in electronics applications
– The field of research for CNTs has become so broad over the past
20 years that they are being tested for use in fields .
 Challenges :
– Too expensive .
– toxicological issues.

12. Solutions
• Driving down CNTs prices by mass production
• Using waste materials for CNTs production such
as polyethylene which are good carbonaceous
feed for CNTs production.
• Develop exposure standards for
Inhalation
Ingestion
Skin contact
Injection

13. APPLICATIONS
Biotechnology
Coating
Environment
Energy storage
Microelectronics
Films
Water filters
Transistors
Biosensors
screens