Abstract
We report a design for terahertz (THz) detection by introducing strain to an area of a single-wall carbon nanotube (SWNT) film. The strain is achieved by bending the film around the center, and a large THz response is measured at the two photo-thermoelectric junctions created on the edges of the strained area. We attribute the THz response to an increase in the Seebeck coefficient of the SWNT film with strain, which gives rise to the photo-thermoelectric effect. The enhanced thermal performance is verified on a macroscopic scale using Non-Equilibrium Green’s Function approach for SWNT networks.
Highlights
Recent studies on carbon nanotubes (CNTs) and CNT composites show great potential for thermoelectric (TE) technologies
The TE performance of CNT films is limited by the portion of metallic CNTs comprising the film
Contrary to other reported schemes for CNT-based THz detection,[10,11,12,13] photo-thermoelectric effect (PTE) THz detection requires no coupling with antennas and can operate at room temperature
Summary
Recent studies on carbon nanotubes (CNTs) and CNT composites show great potential for thermoelectric (TE) technologies. We report on a different scheme of THz response: strain-induced THz detection, which has been achieved by inducing two PTE junctions that are created at the edges of a strained area in a bent single-wall CNT (SWNT) film.
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