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Title: Laser irradiation of carbon nanotube films: Effects and heat dissipation probed by Raman spectroscopy

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 ({approx}1.4 MW/cm{sup 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.
Authors:
; ;  [1] ; ;  [2]
  1. Instituto de Fisica 'Gleb Wataghin,' Unicamp, Campinas, 13083-859 Sao Paulo (Brazil)
  2. Centro de Componentes Semicondutores, Unicamp, Campinas, 13083-870 Sao Paulo (Brazil)
Publication Date:
OSTI Identifier:
22122807
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 2; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ANNEALING; CARBON NANOTUBES; DESIGN; DIFFUSION; EFFICIENCY; ENERGY LOSSES; EQUIPMENT; HEAT TRANSFER; HEATING; IRRADIATION; LASER RADIATION; OXYGEN; RAMAN EFFECT; RAMAN SPECTRA; RAMAN SPECTROSCOPY; THERMAL CONDUCTIVITY; THERMAL DIFFUSIVITY; THERMAL EFFLUENTS; THIN FILMS