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Variable range hopping in oxygen‐exposed single‐wall carbon nanotube networks
Author(s) -
Morgan C.,
Alemipour Z.,
Baxendale M.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200778113
Subject(s) - variable range hopping , carbon nanotube , conductance , oxygen , thermal conduction , materials science , range (aeronautics) , atmospheric temperature range , variable (mathematics) , condensed matter physics , nanotechnology , physics , thermodynamics , composite material , mathematics , quantum mechanics , mathematical analysis
It is shown that the dominant conduction mechanism in single‐wall carbon nanotube networks at room temperature is variable range hopping. Thin networks follow a variable range hopping law throughout the temperature range 4 K < T < 300 K, thick networks display variable range hopping characteristics in the range 50 K < T < 300 K, with deviation to Bloch–Grüneisen behaviour at lower temperatures. The adsorption state of these materials is shown to determine the sign of change in conductance upon subsequent exposure to oxygen. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)