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Carbon nanotubes ppt

Saurabh Nandy
Saurabh Nandy
Saurabh NandyGraduate Engineer

Carbon nanotubes ppt

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SAURABH NANDY
1. WHAT IS A CARBON NANOTUBE ?
2. DISCOVERY OF CARBON NANOTUBES.
3. TYPES OF CARBON NANOTUBES.
4. PROPERTIES OF CARBON NANOTUBES.
5. PROBLEMS RELATED TO CARBON NANOTUBES.
6. SYNTHESIS OF CARBON NANOTUBES.
7. POTENTIAL APPLICATION OF CNT.
#A Carbon Nanotube is a tube-shaped material, made of carbon, having a
diameter measuring on the nanometre scale.
#Carbon Nanotubes are formed from essentially the graphite sheet and the
graphite layer appears somewhat like a rolled-up continuous unbroken
hexagonal mesh and carbon molecules at the apexes of the hexagons.
#Nanotubes are members of the fullerene structural family.
#Their name is derived from their long, hollow structure with the walls
formed by one atom thick sheets of carbon, called graphene.
#1952
Radushkevich and Lukyanovich publish a paper in the Soviet Journal
of Physical Chemistry showing hollow graphitic carbon fibers that are
50 nanometers in diameter.
#1979
John Abrahamson presented evidence of carbon nanotubes at the 14th
Biennial Conference of Carbon at Pennsylvania State University.
#1981
A group of Soviet scientists published the results of chemical and
structural characterization of carbon nanoparticles produced by a
thermocatalytical disproportionation of carbon monoxide.
#1991
Nanotubes discovered in the soot of arc discharge at NEC, by Japanese
researcher Sumio Iijima.
Classified mainly in two types:
1. SINGLE WALLED NANOTUBES
2. MULTI WALLED NANOTUBES
OTHER RELATED STRUCTURES:
#TORUS
#NANOBUD
#GRAPHENATED CARBON NANOTUBES (g-CNTS)
#NITROGEN DOPED CARBON NANOTUBES (N-CNTS)
#PEAPOD
#CUP-STACKED CARBON NANOTUBES
Diameter :- 1 nanometer
Band gap :- 0-2ev
A one atom thick layer of graphene
into seamless cylinder .
Their electrical conductivity can
show metallic or semiconducting
behaviour.
A scanning tunnelling microscopy image of SWNT

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Carbon nanotubes ppt

  • 2. 1. WHAT IS A CARBON NANOTUBE ? 2. DISCOVERY OF CARBON NANOTUBES. 3. TYPES OF CARBON NANOTUBES. 4. PROPERTIES OF CARBON NANOTUBES. 5. PROBLEMS RELATED TO CARBON NANOTUBES. 6. SYNTHESIS OF CARBON NANOTUBES. 7. POTENTIAL APPLICATION OF CNT.
  • 3. #A Carbon Nanotube is a tube-shaped material, made of carbon, having a diameter measuring on the nanometre scale. #Carbon Nanotubes are formed from essentially the graphite sheet and the graphite layer appears somewhat like a rolled-up continuous unbroken hexagonal mesh and carbon molecules at the apexes of the hexagons. #Nanotubes are members of the fullerene structural family. #Their name is derived from their long, hollow structure with the walls formed by one atom thick sheets of carbon, called graphene.
  • 4. #1952 Radushkevich and Lukyanovich publish a paper in the Soviet Journal of Physical Chemistry showing hollow graphitic carbon fibers that are 50 nanometers in diameter. #1979 John Abrahamson presented evidence of carbon nanotubes at the 14th Biennial Conference of Carbon at Pennsylvania State University. #1981 A group of Soviet scientists published the results of chemical and structural characterization of carbon nanoparticles produced by a thermocatalytical disproportionation of carbon monoxide. #1991 Nanotubes discovered in the soot of arc discharge at NEC, by Japanese researcher Sumio Iijima.
  • 5. Classified mainly in two types: 1. SINGLE WALLED NANOTUBES 2. MULTI WALLED NANOTUBES OTHER RELATED STRUCTURES: #TORUS #NANOBUD #GRAPHENATED CARBON NANOTUBES (g-CNTS) #NITROGEN DOPED CARBON NANOTUBES (N-CNTS) #PEAPOD #CUP-STACKED CARBON NANOTUBES
  • 6. Diameter :- 1 nanometer Band gap :- 0-2ev A one atom thick layer of graphene into seamless cylinder . Their electrical conductivity can show metallic or semiconducting behaviour. A scanning tunnelling microscopy image of SWNT
  • 7. Multi-walled nanotubes (MWNT) consist of multiple rolled layers (concentric tubes) of graphene. Interlayer distance :- 3.4 Å To describe structure of MWNT there are two models:- 1. Russian doll model 2. Parchment model
  • 8. TORUS:- It is a carbon nanotube bent in a torus shape (i.e. doughnut shape) NANOBUD :- Carbon Nanobud are created combining carbon nanotubes and fullerenes.
  • 9. GRAPHENATED CARBON NANOTUBE :- They are new hybrids that combines graphitic foliates grown along the sidewalls of MWNT. NITROGEN DOPED CARBON NANOTUBE :- These are used for enhancing storage capacity of Li-ion batteries. N-doping provides defects in the walls of CNT's allowing for Li ions to diffuse into inter-wall space.
  • 10. Peapod :- A carbon peapod is a novel hybrid carbon material which traps fullerene inside a Carbon nanotube. CUP-STACKED CARBON NANOTUBES :- CSCNTs exhibit semiconducting behaviours due to the stacking microstructure of graphene layers.
  • 11. Strength :- Carbon nanotubes are the strongest, flexible and stiffest materials yet discovered in terms of tensile strength and elastic modulus respectively. Hardness :- The hardness (152 Gpa) and bulk modulus (462–546 Gpa) of carbon nanotubes are greater than diamond, which is considered the hardest material. Electrical Properties:- Because of the symmetry and unique electronic structure of graphene, nanotube has a very high current carrying capacity.
  • 12. Thermal Conductivity:- All nanotubes are expected to be very good thermal conductors along the tube. EM Wave absorption:- There has been some research on filling MWNTs with metals, such as Fe, Ni, Co, etc., to increase the absorption effectiveness of MWNTs in the microwave regime. Thermal properties:- All nanotubes are expected to be very good thermal conductors along the tube, but good insulators laterally to the tube axis.
  • 13. Fiber material Specific Density Young's modulus(Tpa) Strength (Gpa) Strain at break(%) Carbon Nanotube 1.3 – 2 1 10 – 60 10 HS Steel 7.8 0.2 4.1 <10 Carbon fiber-PAN 1.7 – 2 0.2 – 0.6 1.7 – 5 0.3 – 2.4 Carbon fiber-Pitch 2 – 2.2 0.4 – 0.96 2.2 – 3.3 0.27 – 0.6 E/s-Glass 2.5 0.07 – 0.08 2.4 – 4.5 4.8 Kevlar-49 1.4 0.13 3.6 – 4.1 2.8 Mechanical Properties of Engineering Fibers Properties of Conductive Materials Material Thermal conductivity Electrical conductivity Carbon Nanotube > 3000 10^6 – 10^7 Copper 400 6 x 10^7 Carbon fiber-Pitch 1000 2 - 8.5 x 10^6 Carbon fiber-PAN 8 - 105 6.5 - 14 x 10^6
  • 14. Toxicity:- Under some conditions, nanotubes can cross membrane barriers, which suggests that if raw materials reach the organs they can induce harmful effects such as inflammatory and fibrotic reactions. Crystallographic defect:- As with any material, the existence of a crystallographic defect affects the material properties. Defects can occur in the form of atomic vacancies.
  • 15. There are three methods using which we can produce carbon nanotubes. 1. ARC DISCHARGE METHOD :-
  • 17. 3. CHEMICAL VAPOR DEPOSITION (CVD) :-
  • 18. 1. STRUCTURAL 2. ELECTROMAGNETIC 3. ELECTRO ACOUSTIC 4. CHEMICAL 5. MECHANICAL 6. ELECTRICAL CIRCUITS a. Interconnects b. Transistors c. Electronic design and design automation 7. MEDICINE
  • 19. EN.WIKIPEDIA.ORG/WIKI/CARBONNANOTUBES WWW.SCIENCEDAILY.COM HOW STUFF WORKS – WWW.HOWSTUFFWORKS.COM IMAGES.GOOGLE.CO.IN/IMAGES WWW.UNDERSTANDINGNANO.COM/NANOTUBES- CARBON.HTML WWW.NANOCYL.COM › CNT EXPERTISE CENTRE WWW.PA.MSU.EDU/CMP/CSC/NANOTUBE.HTML