Carbon nanotubes

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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

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Carbon nanotubes

  1. 1. A Presentation on CARBON NANOTUBES
  2. 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. 3. Structure of CNTs
  4. 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. 5. Single-walled CNT
  6. 6. : Multi-walled Nanotubes (2 . MWNTs consist of multiple rolled layers (concentric tubes) of graphite * :Structure Model Russian Doll Parchment Model * Model *
  7. 7. Multi-walled CNTs
  8. 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. 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. 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. 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. 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. 13. Application of CNTs In Electrical Circuits As Paper Batteries In Solar Cells (3 In Ultracapacitor (4 structural application (5 2) (1
  14. 14. In DNA detection (6 In High-reliability touchscreen 8) Nanoradio As a Flywheel (9 In Fuel Cells (10 (7
  15. 15. Advantages Of CNT Incredible Mobilities (1 Bandgap tunability (2 Processability (3 Low Schottky Barriers (4
  16. 16. Disadvantages of CNT Very Expensive to produce * Around $1500 per gram *
  17. 17. Thank you

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