Paper Title:
Hydrogen Relaxation Process in HiPco Carbon Nanotubes Studied by Mechanical Spectroscopy
  Abstract

The first mechanical spectroscopy experiments in HiPco carbon nanotubes from room temperature to 3 K revealed a thermally activated relaxation process at about 25 K for frequencies in the kHz range. The peak is due to the presence of a very mobile species performing about 103 jumps per second at the peak temperature. The activation energy obtained by the peak shift with frequency is Ea = 54.7 meV; the value of the pre-exponential factor of the Arrhenius law for the relaxation time, τ0 = 10-14 s, which is typical of point defect relaxation and suggests that the process is originated by the dynamics of hydrogen or by H complexes. The peak is much broader than a single Debye relaxation process, indicating the presence of intense elastic interactions in the highly disordered bundle structure. There are indications that the relaxation process is governed by a quantum mechanism.

  Info
Periodical
Solid State Phenomena (Volume 115)
Edited by
B.M. Darinskii and L.B. Magalas
Pages
163-168
DOI
10.4028/www.scientific.net/SSP.115.163
Citation
R. Cantelli, A. Paolone, S. Roth, U. Dettlaff, "Hydrogen Relaxation Process in HiPco Carbon Nanotubes Studied by Mechanical Spectroscopy", Solid State Phenomena, Vol. 115, pp. 163-168, 2006
Online since
August 2006
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Price
$32.00
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