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Terahertz-infrared electrodynamics of single-wall carbon nanotube films.

Nanotechnology 2017 November 4
Broad-band (4-20 000 cm-1 ) spectra of real and imaginary conductance of a set of high-quality pristine and AuCl3 -doped single-walled carbon nanotube (SWCNT) films with different transparency are systematically measured. It is shown that while the high-energy (≥1 eV) response is determined by well-known interband transitions, the lower-energy electrodynamic properties of the films are fully dominated by unbound charge carriers. Their main spectral effect is seen as the free-carrier Drude-type contribution. Partial localization of these carriers leads to a weak plasmon resonance around 100 cm-1 . At the lowest frequencies, below 10 cm-1 , a gap-like feature is detected whose origin is associated with the energy barrier experienced by the carriers at the intersections between SWCNTs. It is assumed that these three mechanisms are universal and determine the low-frequency terahertz-infrared electrodynamics of SWCNT wafer-scale films.

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