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.

• Periodical: Solid State Phenomena (Volume 115)
• Pages: 163-168
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.115.163
• Online since: August 2006
• Authors: Rosario Cantelli, Achille Paolone, S. Roth, U. Dettlaff
• Keywords: Carbon Nanotube (CN), Hydrogen Dynamics, Point Defect

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