Final Ppt of Carbon Nanotubes

8/4/2019 Final Ppt of Carbon Nanotubes

1/29

SUBMITTED TO:

Mr. TARUN BENARA

Mr. ABHAY KUMAR SHARMA

(SEMINAR CORDINATOR)

PRESENTED & SUBMITTED BY:

MUKESH KUMAR KUMAWAT

EC

-

37V SEM

ETER


2/29

CARBON NANOTUBES


3/29

CONTENTS

INTRODUCTION

STRUCTURE of CNT

SYNTHISIS of CNTS

PROPERTIES of CNTSADVANTAGES

APPLICATIONS

LIMITATIONS of CNTS

FUTURE ENHANCEMENTS

CONCLUSION

REFERENCES


4/29

INTRODUCTIONWhat is a Carbon Nanotube?

Carbon nanotubes (CNTs) are allotropes of

carbon with a cylindrical nanostructure.

Nanotubes have been constructed with length-to-diameter ratio of up to 132,000,000:1.


5/29

Contd......CNT is configurationally equivalent to a two dimensional

graphene sheet rolled into a tube.


6/29

STRUCTUREFolded version of two dimensional graphite sheets

Depending on the dimension of the graphite

sheet and type of folding, different types can becreated. Eg :SWNTS, MWNTS

Sidewalls consist of only hexagonal carbon rings


7/29

TYPES OF CNTSThere are two types of CNTS

1. Single walled Nanotubes(SWNTS)

2.Multi walled Nanotubes (MWNTS)


8/29

1.SINGLE WALLED NANOTUBES

Most single-walled nanotubes(SWNT)

have a diameter of close to 1 nanometer,with a tube length that can be manymillions of times longer.

Single-walled nanotubes are an

important variety of carbon nanotubebecause they exhibit electric propertiesthat are not shared by the multi-walledcarbon nanotube (MWNT) variants.

Schematic of a SWNT


9/29

2.MULTIWALLNANOTUBES

Multi-walled nanotubes(MWNT) consist of multiplerolled layers (concentric

tubes) of graphene.

MWNTs are zero-gapmetals.

Schematic of a MWNT


10/29

SYNTHISIS of CNTSThere are three techniques to produced

nanotubes

1. Arc discharge method2. Laser Ablation method

3. Chemical Vapour Deposition (CVD) Method


11/29

a)Arc discharge method

Graphite electrodes placed in an inert Helium atmosphereWhen DC current 50-300amps at 20 volts to the rods and

creates a high temperature discharge between the twoelectrodes.The discharge vaporizes the anode rod, and it forms carbon

nanotubes For SWNT mixed metal catalyst is inserted intoanode


12/29


13/29

c)Chemical Vapor Deposition

Hydrocarbon + Fe/Co/Ni catalyst 550-750C CNT

CVD is the most common method for producing carbonnanotubes .

An energy source, such as resistively heated coil, transfers

energy to carbon molecules that are in the gas phase.


14/29

Common gaseous carbon sources are methane, carbonmonoxide and acetylene.

The energy source causes carbon atoms to separate from themolecules and the carbon atoms attach themselves to the metalcatalysts. After this, the carbon nanotubes start to grow

Contd...


15/29


16/29

c)Mechanical property

SWNTS possess incredible mechanical resistance becausetheir carbon atoms are united by the strongest bonds in nature .Inaddition, they are highly flexible, and can be bent repeatedly up to

90 without being damaged.They have a very low density, about 1/6 of the density of steel,but are much stronger than steel.They would have the highest Youngs modulus (or stiffness) ofany material1 Tpa which is five times the stiffness of steel.


17/29

AdvantagesUltra Strength

Fast electron conductivity

Very small with high frequency and low powerconsumption.

Velocity of electrons in carbon nanotubes is equal tovelocity of light.

Mobility of electron in carbon nanotubes is 200 timesthat of silicon.


18/29

Applications


19/29

Contd......

1.IN ELECTRONICSA) Flat Panel DisplayLow power consumption, High brightnessWide viewing angleFast response rateWide operating temperature range

B) As Conductors and TransistorsC) Ultra-capacitorsHigh surface area to mass ratio of graphene.Greater energy storage density than currentlyavailable.


20/29

2.Electrical

(A)Field emission in vacuum electronics

(B)Nano lithography

3.Energy storage

(A)Lithium batteries

(B)Hydrogen storage


21/29

.

4.Biological

(A)Manufacture ofArtificial muscles

(B)DNA sequencing

(C)Bio-sensors


22/29

5.Auto parts60 percent of cars produced today

now have fuel lines madewithcarbon nanotubes.

The carbon nanotubes inside the

fuel lines are intended to reduce therisk of explosions by inhibitingstatic electricity.

The single-seater car's


23/29

6.Sporting EquipmentCarbon nanotubes have already

been added to sports equipment

such as bats, bicycles, golf clubs,

and hockey sticks in order toimpart more strength and absorb

vibrations.

Carbon Nanotube hockey stick


24/29

Limitations of CNTSHigh-Quality nanotubes can only be produced in very

limited quantities -commercial nanotube soot costs 10times as much as gold.

Since these particles are very small, problems canactually arise from the inhalation of these minute

particles.


25/29

FUTURE ENHANCEMENTSIn future carbon nanotubes replaces carbon fiber.

It is also used inVLSI interconnections and in waterpurification.

It replaces silicon based diodes and transisters in

future.


26/29

CONCLUSIONCarbon nanotubes are the next step in miniaturizing

electronic circuits, replacing silicon transistors anddiodes, which are fast reaching the theoretical limits

of size and speed of operation.

Using CNTs, nanochips can be made with entirecircuits on it. Ideal diodes can be made from CNTs,resulting in highly efficient electronic circuits. Further,CNTs have a number of other uses other than in theelectronic industry, as seen here.


27/29

REFERENCEShttp://en.wikipedia.org/wiki/Carbon_nanotubehttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-

Nanotubes

http://www.understandingnano.com/nanotubes-carbon.htmlhttp://www.research.ibm.com/nanoscience/nanotubes.ht

mlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-

Structure-Properties-and-Applications_251435.html http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/

http://www.azonano.com/article.aspx?ArticleID=1199
http://en.wikipedia.org/wiki/Carbon_nanotubehttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubeshttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubeshttp://www.understandingnano.com/nanotubes-carbon.htmlhttp://www.understandingnano.com/nanotubes-carbon.htmlhttp://www.research.ibm.com/nanoscience/nanotubes.htmlhttp://www.research.ibm.com/nanoscience/nanotubes.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://www.azonano.com/article.aspx?ArticleID=1199http://www.azonano.com/article.aspx?ArticleID=1199http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://nanogloss.com/nanotubes/what-is-carbon-nanotube-synthesis/http://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://ebookee.org/Carbon-Nanotubes-Synthesis-Structure-Properties-and-Applications_251435.htmlhttp://www.research.ibm.com/nanoscience/nanotubes.htmlhttp://www.research.ibm.com/nanoscience/nanotubes.htmlhttp://www.understandingnano.com/nanotubes-carbon.htmlhttp://www.understandingnano.com/nanotubes-carbon.htmlhttp://www.understandingnano.com/nanotubes-carbon.htmlhttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubeshttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubeshttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubeshttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubeshttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubeshttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubeshttp://www.nanocyl.com/CNT-Expertise-Centre/Carbon-Nanotubeshttp://en.wikipedia.org/wiki/Carbon_nanotube


28/29

Thankyou


29/29

Final Ppt of Carbon Nanotubes

Documents