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Unformatted text preview: 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 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....
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This note was uploaded on 10/24/2008 for the course ENGRI 1110 taught by Professor Giannelis during the Fall '07 term at Cornell.
- Fall '07