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Erschienen in:
2014 | OriginalPaper | Buchkapitel
Lattice Specific Heat of Graphene Nanoribbons
verfasst von : A. S. Nissimagoudar, N. S. Sankeshwar
Erschienen in: Physics of Semiconductor Devices
Verlag: Springer International Publishing
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The lattice specific heat,
C
L
, of graphene nanoribbons (GNRs) is studied, based on the elastic continuum model. An expression for
C
L
is obtained taking into account the modification of acoustic phonon dispersion due to spatial confinement. Considering the contributions from longitudinal, transverse, torsional and flexural acoustic phonon modes, numerical calculations of
C
L
, as a function of temperature, are presented for
T
< 3,000 K. With increase in temperature,
C
L
is found to increase up to
T
< 1,200 K and then tend to saturate to classical limit of 2,078 J/kgK at higher temperatures, the major contribution being from flexural modes. At low temperatures
C
L
is found to decrease with increase in GNR width.