Spatially-Resolved Temperature Measurements of Electrically-Heated Carbon Nanotubes

Abstract

Spatially-resolved Raman spectra of individual pristine suspended carbon nanotubes are observed under electrical heating. The Raman G+ and G- bands show unequal temperature profiles. The preferential heating is more pronounced in short nanotubes (2 um) than in long nanotubes (5 um). These results are understood in terms of the decay and thermalization of non-equilibrium phonons, revealing the mechanism of thermal transport in these devices. The measurements also enable a direct estimate of thermal contact resistances and the spatial variation of thermal conductivity.

To appear in Phys. Rev. Lett

References in corpus (2)

• Raman-modes of index-identified free-standing single-walled carbon nanotubes
• Coupled dynamics of electrons and phonons in metallic nanotubes: current saturation from hot phonons generation

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• Electron-phonon coupling in single walled carbon nanotubes determined by shot noise
• Kinetics Modeling of Nanoparticle Growth on and Evaporation off Nanotubes