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Type: Artigo de periódico
Title: Laser irradiation of carbon nanotube films: Effects and heat dissipation probed by Raman spectroscopy
Author: Mialichi, JR
Brasil, MJSP
Iikawa, F
Verissimo, C
Moshkalev, SA
Abstract: We investigate the thermal properties of thin films formed by single- and multi-walled carbon nanotubes submitted to laser irradiation using Raman scattering as a probe of both the tube morphology and the local temperature. The nanotubes were submitted to heating/cooling cycles attaining high laser intensities (similar to 1.4 MW/cm(2)) under vacuum and in the presence of an atmosphere, with and without oxygen. We investigate the heat diffusion of the irradiated nanotubes to their surroundings and the effect of laser annealing on their properties. The presence of oxygen during laser irradiation gives rise to an irreversible increase of the Raman efficiency of the carbon nanotubes and to a remarkable increase of the thermal conductivity of multi-walled films. The second effect can be applied to design thermal conductive channels in devices based on carbon nanotube films using laser beams. (C) 2013 AIP Publishing LLC.
Country: EUA
Editor: Amer Inst Physics
Citation: Journal Of Applied Physics. Amer Inst Physics, v. 114, n. 2, 2013.
Rights: aberto
Identifier DOI: 10.1063/1.4813485
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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