Abstract
ABSTRACTThe effects of polymer structures on the thermoelectric properties of polymer-wrapped semiconducting carbon nanotubes have yet to be clarified for elucidating intrinsic transport properties. We systematically investigate thickness dependence of thermoelectric transport in thin films containing networks of conjugated polymer-wrapped semiconducting carbon nanotubes. Well-controlled doping experiments suggest that the doping homogeneity and then in-plane electrical conductivity significantly depend on film thickness and polymer species. This understanding leads to achieving thermoelectric power factors as high as 412 μW m−1 K−2 in thin carbon nanotube films. This work presents a standard platform for investigating the thermoelectric properties of nanotubes.
Highlights
Investigating thermoelectric transport in single-walled carbon nanotubes (SWNTs) deepens our understanding of their electronic properties as a quasi-one dimensional material and potential as energy harvesting materials [1]
We examine the influence of film thickness and polymer species on the thermoelectric properties of the s-SWNT films
Considering that the plasmon resonance is generated by the collective motion of free carriers [27], we suppose that the doping level of s-SWNT films obtained here is low in comparison with literatures
Summary
Investigating thermoelectric transport in single-walled carbon nanotubes (SWNTs) deepens our understanding of their electronic properties as a quasi-one dimensional material and potential as energy harvesting materials [1]. Ferguson and Blackburn have very recently investigated thermoelectric transport in doped semiconducting SWNT thin films [1,22]. Their reported power factors were approximately five times larger than those of s-SWNT films prepared by other separation methods. These polymer-functionalized s-SWNT materials can be recognized as the preferred platform enabling the investigation of structural effects on thermoelectric properties. We examine the influence of film thickness and polymer species on the thermoelectric properties of the s-SWNT films Such molecular factors are important for controlling structure separation mentioned above and dopant miscibility. The effects of polymer dispersants on the thermoelectric properties are elucidated
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