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Thermal Conduction Coefficient in Single Wall Carbon Nanotubes

Thermal Conduction Coefficient in Single Wall Carbon Nanotubes. David R. Myers February 21, 2007 EE 235. Bulk Thermal Conductivity. Typical Values Air 26.3 X 10 -3 W/mK Glass 1.4 W/mK Gold 317 W/mK Graphite 1950 W/mK Diamond 2300 W/mK. T H. k. T C. T. x. Δ x. Microscopic Theory.

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Thermal Conduction Coefficient in Single Wall Carbon Nanotubes

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  1. Thermal Conduction Coefficient in Single Wall Carbon Nanotubes David R. Myers February 21, 2007 EE 235

  2. Bulk Thermal Conductivity • Typical Values • Air 26.3 X 10-3 W/mK • Glass 1.4 W/mK • Gold 317 W/mK • Graphite 1950 W/mK • Diamond 2300 W/mK TH k TC T x Δx

  3. Microscopic Theory • Thermal conductivity governed through free electrons interactions and phonons • Carbon nanotubes have very low scattering at the boundaries and thus high thermal conductivities Conserves Phonon Momentum Changes Phonon Momentum • Quantum of Thermal Conductance

  4. Testing Apparatus Fabrication and Function • Heat one side • Measure the other resulting temperature • Use Q=(kA)(ΔT)

  5. Measuring Thermal Conductivity • Nanowire Placement: • Sharp Probe to pick up sample • Nanowire Solution Spun on wafer • CVD to grow individual nanowires across gap • Cool Tricks for CVD: • Old - Spin solution onto wafer with catalyst nanoparticles • New – Sharp probe to directly deliver solutions onto membrane

  6. Diamond Gold Results • Don’t really know the nanotube thickness, but makes a big difference • In any case, outperforms diamond • Umklapp Scattering is weak in 2.76 μm 1-3 nm CNT • Notice increasing temperature gives increasing conductivity (will continue until scattering dominates

  7. Questions?

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