Temperature-dependent properties of an individual memsintegrated single-walled carbon nanotube

We present spatially resolved Raman studies on individual single-walled carbon nanotubes (SWNTs). Samples were comprised of microheaters with integrated and suspended SWNTs. We found the phonon frequency to depend on temperature by domega/dT = -0.0305 cm^-1/K. The highest measured local temperature in a SWNT was about 1000 K. Further studies emphasize the effect of temperature on the energy shift of the optical transition energies. By performing spatially resolved line cuts across the tubes, we found a strong off-resonance effect resulting in reduced Raman intensity due to transition energy shifts. Based on a thermally activated transport model, the behavior of a heated SWNT in terms of its electrical resistance can be predicted.