11-2-07 - Carbon Nanotubes Composites B 33 263 2002...

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11/2/07 Carbon Nanotubes Composites B, 33, 263, 2002 Scientific American, 62, Dec, 2000 Cnt in contrast to C 60 which is definitive on the amount of atoms, CNT has different arrangements History o Nabometer size cylinders made out of C o Layers of graphite rolled up into a cylinder o Multi-wall nanotubes, MWNT S. Ijima, NEC 1991 (earlier discovery in Russia) o Single-wall nanotube, SWNT 1 nm in diameter Properties and applications o Extraordinary strength: o Tunable electronic properties: can arrange from metallic to semi- conducting ( bandgap there can be tuned too) o Good thermal conductors: not widely known for many materials Properties (complete from slides) Property SWNT Benchmark Size D: 0.6- 1.8 nm Litho: 50 nm Density 1.3-1.4 g/cm 3 Al: 2.7 g/cm 3 Steel 7.8 g/cm 3 Strength (stress that can 30-200 gPa Steel 1.5 gPa
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be applied before you break the material) RESILIENCE Bendabea t large angles Metals and carbon fracture Current carrying 1 B amp/cm 2 Cu: 1 M amp/cm 2 Field Emission 1.3 V/neu Mo: 50-100 V/neu Heat Transmission 6000 W/mK Diamond 3300 W/mK Stability 2800 degress C 750 degrees Celsius in air Diamond is the best heat conductor but CNT has twice the capacity. Mechanical Properties 1. Strength: 200 GPa tension or compression that can be applied till material breaks 2. Stiffness (modulus): 1 TPa 3. Density: 1.3 g/cm 3 4. Highest specific strength.
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  • Fall '07
  • GIANNELIS
  • Tensile strength, Carbon nanotube, Tube diameter, Carbon Nanotubes Composites, Tunable electronic properties

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