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Title: Improvement of the identification of multiwall carbon nanotubes carpet thermal conductivity by pulsed photothermal method

Abstract

Thermal properties in multiwall carbon nanotubes carpets and micro-devices are investigated using a nanosecond photothermal method. Gradually, the identification model and experimental protocol are performed to increase the method accuracy for the thermal conductivity determination. In the experimental protocol, a nanosecond UV monopulse laser beam is used to heat the surface of a multilayer (600 nm of Ti/20 {mu}m of carbon nanotube carpet) sample. In the 1D identification model with two layers and a thermal contact resistance, the effect of the laser excitation temporal shape is taken into account. In this study, this first approach allows to improve the accuracy of apparent thermal conductivity measurements of multiwall carbon nanotubes carpet. The carbon nanotubes carpet apparent thermal conductivity value went from being to 180 {+-} 5 W Multiplication-Sign m{sup -1} Multiplication-Sign K{sup -1}. In the second approach, two laser beams are coupled in order to increase the interaction time duration from 27 ns to 60 ns. It becomes possible to probe different depths in the carpet. The obtained value (180 W Multiplication-Sign m{sup -1} Multiplication-Sign K{sup -1}) confirms the pulsed photothermal method consistency for porous samples. Finally, assuming that the carbon nanotubes are parallel and without any defects, the equivalent intrinsicmore » thermal conductivity of a single carbon nanotube is estimated to be around 3600 W Multiplication-Sign m{sup -1} Multiplication-Sign K{sup -1}.« less

Authors:
; ; ; ; ;  [1]
  1. GREMI, Universite d'Orleans, CNRS UMR 6606, 14 rue d'Issoudun, BP 6744, 45067 Orleans (France)
Publication Date:
OSTI Identifier:
22089575
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 112; Journal Issue: 9; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CARBON NANOTUBES; CRYSTAL DEFECTS; EXCITATION; INTERACTIONS; LAYERS; POROUS MATERIALS; SURFACES; THERMAL CONDUCTIVITY

Citation Formats

Amin-Chalhoub, E., Wattieaux, G., Semmar, N., Gaillard, M., Petit, A., and Leborgne, C. Improvement of the identification of multiwall carbon nanotubes carpet thermal conductivity by pulsed photothermal method. United States: N. p., 2012. Web. doi:10.1063/1.4759371.
Amin-Chalhoub, E., Wattieaux, G., Semmar, N., Gaillard, M., Petit, A., & Leborgne, C. Improvement of the identification of multiwall carbon nanotubes carpet thermal conductivity by pulsed photothermal method. United States. doi:10.1063/1.4759371.
Amin-Chalhoub, E., Wattieaux, G., Semmar, N., Gaillard, M., Petit, A., and Leborgne, C. Thu . "Improvement of the identification of multiwall carbon nanotubes carpet thermal conductivity by pulsed photothermal method". United States. doi:10.1063/1.4759371.
@article{osti_22089575,
title = {Improvement of the identification of multiwall carbon nanotubes carpet thermal conductivity by pulsed photothermal method},
author = {Amin-Chalhoub, E. and Wattieaux, G. and Semmar, N. and Gaillard, M. and Petit, A. and Leborgne, C.},
abstractNote = {Thermal properties in multiwall carbon nanotubes carpets and micro-devices are investigated using a nanosecond photothermal method. Gradually, the identification model and experimental protocol are performed to increase the method accuracy for the thermal conductivity determination. In the experimental protocol, a nanosecond UV monopulse laser beam is used to heat the surface of a multilayer (600 nm of Ti/20 {mu}m of carbon nanotube carpet) sample. In the 1D identification model with two layers and a thermal contact resistance, the effect of the laser excitation temporal shape is taken into account. In this study, this first approach allows to improve the accuracy of apparent thermal conductivity measurements of multiwall carbon nanotubes carpet. The carbon nanotubes carpet apparent thermal conductivity value went from being to 180 {+-} 5 W Multiplication-Sign m{sup -1} Multiplication-Sign K{sup -1}. In the second approach, two laser beams are coupled in order to increase the interaction time duration from 27 ns to 60 ns. It becomes possible to probe different depths in the carpet. The obtained value (180 W Multiplication-Sign m{sup -1} Multiplication-Sign K{sup -1}) confirms the pulsed photothermal method consistency for porous samples. Finally, assuming that the carbon nanotubes are parallel and without any defects, the equivalent intrinsic thermal conductivity of a single carbon nanotube is estimated to be around 3600 W Multiplication-Sign m{sup -1} Multiplication-Sign K{sup -1}.},
doi = {10.1063/1.4759371},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 112,
place = {United States},
year = {2012},
month = {11}
}