Abstract:
ABSTRACT
In a nondegenerate fluorinated single-walled carbon nanotube (FSWCNT) in
the hypersound domain, q` 1, where q is the acoustic wavenumber and ` is
the carrier mean free path, a theoretical study of semiclassical carrier miniband
transport across a periodic potential was carried out. First, the effect of an
acoustic wave on FSWCNT was investigated, and it was discovered that
high-frequency carrier dynamics can be created, though the wavenumber or
wave amplitude is critical. Depending on the wave amplitude and the carrier’s
initial position in the acoustic wave, there were two dynamical regimes.
Bloch-like oscillations could be induced by applying a large enough potential
amplitude/wavenumber, resulting in ultra-high negative differential velocity, or
the carrier could be dragged through the FSWCNT and permitted to drift in
periodic orbits with frequencies far above the gigahertz frequencies (GHz) of
the acoustic wave. A high negative differential velocity induces charge
domains in FSWCNT at transitions between these two carrier dynamic
regimes, which generated extra features in the current oscillations. Secondly,
invoking an analytical technique which is traceable and the phonon LBM, the
dimensionless figure of merit (ZT ) for FSWCNT was explored. The ZT was
found to be substantially influenced by the FSWCNT parameters ∆s, ∆z, Eo and
no. At room temperatures and beyond, optimizing ∆s, ∆z and no resulted in a
ZT greater than 6 (i.e., ZT > 6). As a result of the high ZT achieved, the
FSWCNT can be considered a good thermoelement material.
