Environmental Engineering Reference
In-Depth Information
Figure 3.9
(a)Transmissionfunctionversusphononfrequency(
ω
)and(b)
the scaled thermal conductance (
σ
/
S
) versus temperature (
T
) for 16-ZGNR
and 28-AGNR. The inset shows the decrease of scaled thermal conductance
(
)inducedbyfixingedgeatoms.ReprintedwithpermissionfromRef.[38].
Copyright 2009, AIPPublishing LLC.
Graphene, the bulk counterpart of GNRs, is isotropic in thermal
conductance. Cutting graphene into GNRs introduces edges, where
the bonding environment is different from in the bulk. Different
edge shapes show different transport ability. Generally, if the edge-
induced change in the bonding strength is smaller along the
transport direction, phonons of quasi-1D transport systems would
become more delocalized, thus phonon transmission and thermal
conductance would be higher. This suggests that by analyzing
