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AVERZS TECHNOLOGIES                   A leading Research and Development Division                                         ...
AVERZS TECHNOLOGIES                   A leading Research and Development Division                                         ...
AVERZS TECHNOLOGIES                               A leading Research and Development Division                             ...
AVERZS TECHNOLOGIES                       A leading Research and Development Division                                     ...
AVERZS TECHNOLOGIES                           A leading Research and Development Division                                 ...
AVERZS TECHNOLOGIES                   A leading Research and Development Division                                         ...
AVERZS TECHNOLOGIES                        A leading Research and Development Division                                    ...
AVERZS TECHNOLOGIES                          A leading Research and Development Division                                  ...
AVERZS TECHNOLOGIES                           A leading Research and Development Division                                 ...
AVERZS TECHNOLOGIES                              A leading Research and Development Division                              ...
AVERZS TECHNOLOGIES                            A leading Research and Development Division                                ...
AVERZS TECHNOLOGIES                           A leading Research and Development Division                                 ...
AVERZS TECHNOLOGIES                   A leading Research and Development Division                                         ...
AVERZS TECHNOLOGIES                               A leading Research and Development Division                             ...
AVERZS TECHNOLOGIES                   A leading Research and Development Division                                         ...
AVERZS TECHNOLOGIES                   A leading Research and Development Division                                         ...
AVERZS TECHNOLOGIES                   A leading Research and Development Division                                         ...
AVERZS TECHNOLOGIES                              A leading Research and Development Division                              ...
AVERZS TECHNOLOGIES                               A leading Research and Development Division                             ...
AVERZS TECHNOLOGIES                           A leading Research and Development Division                                 ...
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Carbon Nano-tubes

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Carbon Nano-tubes

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Transcript of "Carbon Nano-tubes"

  1. 1. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Carbon Nanotubes T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  2. 2. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE General Fact Graphite vs. Diamonds Whats the difference between graphite and diamonds? Both materials are made of carbon, but both have vastly different properties. Graphite is soft; diamonds are hard. Graphite conducts electricity, but diamonds are insulators and cant conduct electricity. Graphite is opaque; diamonds are usually transparent. Graphite and diamonds have these properties because of the way the carbon atoms bond together at the nanoscale. T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  3. 3. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE A carbon nanotube is a Nano-size cylinder of carbon atoms. Imagine a sheet of carbon atoms, which would look like a sheet of hexagons. If you roll that sheet into a tube, youd have a carbon nanotube. Carbon nanotube properties depend on how you roll the sheet. In other words, even though all carbon nanotubes are made of carbon, they can be very different from one another based on how you align the individual atoms. With the right arrangement of atoms, you can create a carbon nanotube thats hundreds of times stronger than steel, but six times lighter Engineers plan to make building material out of carbon nanotubes, particularly for things like cars and airplanes. Lighter vehicles would mean better fuel efficiency, and the added strength translates to increased passenger safety. Carbon nanotubes can also be effective semiconductors with the right arrangement of atoms. Scientists are still working on finding ways to make carbon nanotubes a realistic option for transistors in microprocessors and other electronics. T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  4. 4. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Carbon Nanotube• Discovered in 1991 by Lijima• It has Unique material properties• They are nearly One-dimensional structures• There are two types Single-walled and Multi-walled T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  5. 5. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Introduction: nanotube structure Roll a Graphene sheet in a certain direction: • Armchair structure • Zigzag structure • Chiral structure• Single-walled carbon nanotubes exist in a variety of structures corresponding to the many ways a sheet of Graphene can be wrapped into a seamless tube.• Each structure has a Wrapping Angle say (a). T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  6. 6. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  7. 7. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCERolling a graphene sheet to get SWNT T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  8. 8. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Armchair• The “armchair” structures, with a = 30°, have metallic character T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  9. 9. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Zigzag• The “zigzag” tubes, for which a = 0°, can be either semimetallic or semiconducting, depending on the specific diameter. T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  10. 10. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Chiral• Nanotubes with chiral angles intermediate between 0 and 30° include both semimetals and semiconductors. (“Armchair” and “zigzag” refer to the pattern of carbon–carbon bonds along a tube’s circumference.) T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  11. 11. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Special properties• Difference in chemical reactivity for end caps and side wall• High axial mechanical strength• Special electrical properties: • Metallic • Semi conducting T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  12. 12. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Properties of nanotubes• CNTs have High Electrical Conductivity• CNTs have Very High Tensile Strength• CNT are Highly Flexible- can be bent considerably without damage• CNTs are Very Elastic ~18% elongation to failure• CNTs have High Thermal Conductivity• CNTs have a Low Thermal Expansion Coefficient• CNTs are Good Electron Field Emitters• CNTs have a High Aspect Ratio (length = ~1000 x diameter T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  13. 13. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE MWNT T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  14. 14. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Synthesis: overview• Commonly applied techniques: • Chemical Vapor Deposition (CVD) • Arc-Discharge • Laser ablation• Techniques differ by: • Type of nanotubes (SWNT / MWNT ) • Catalyst used • Yield • Purity T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  15. 15. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Synthesis: CVD •Gas phase deposition •Large scale possible •Relatively cheap T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  16. 16. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Arc discharge • Relatively cheap • Many side-products T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  17. 17. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Synthesis: laser ablation • Use of very strong laser • Expensive (energy costs) • Commonly applied T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  18. 18. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Purification• Contaminants: • Catalyst particles • Carbon clusters • Smaller fullerenes: C60 / C70• Demerits in purification of Nanotubes: • Completely retain nanotube structure • Single-step purification • Only possible on very small scale: • Isolation of either semi-conducting SWNTs T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  19. 19. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Purification techniques• Removal of catalyst: • Acidic treatment (+ sonication) • Thermal oxidation • Magnetic separation (Fe)• Removal of small fullerenes • Micro filtration • Extraction with CS2• Removal of other carbonaceous impurities • Thermal oxidation • Selective functionalisation of nanotubes • Annealing T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
  20. 20. AVERZS TECHNOLOGIES A leading Research and Development Division EMERGING EXCELLENCE Applications• Thermal Conductivity of CNTs• Field Emission of CNTs• Conductive Plastics with CNTs• Energy Storage using CNTs• Conductive Adhesives and Connectors with CNTs• Molecular Electronics based on CNTs• Thermal Materials with CNTs• Structural Composites with CNTs• Fibers and Fabrics with CNTs• Catalyst Supports using CNTs• Biomedical Applications of CNTs• Air and Water Filtration using CNTs• Ceramic Applications with CNTs T2, Reshma Apartments, 3rd Floor, No.324, MKN Road, Alandur , Chennai – 16 Mobile: 95000 48577, 96000 88172, Mail:info@averzs.com, URL: www.averzs.com
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