Tailored semiconducting carbon nanotube networks with enhanced thermoelectric properties

Azure D. Avery, Ben H. Zhou, Jounghee Lee, Eui-Sup Lee, Elisa M. Miller, Rachelle Ihly, Devin Wesenberg, Kevin S. Mistry, Sarah L. Guillot, Barry L. Zink, Yong-Hyun Kim, Jeffrey L. Blackburn () and Andrew J. Ferguson ()
Additional contact information
Azure D. Avery: Chemistry and Nanoscience Center, National Renewable Energy Laboratory
Ben H. Zhou: Chemistry and Nanoscience Center, National Renewable Energy Laboratory
Jounghee Lee: Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology
Eui-Sup Lee: Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology
Elisa M. Miller: Chemistry and Nanoscience Center, National Renewable Energy Laboratory
Rachelle Ihly: Chemistry and Nanoscience Center, National Renewable Energy Laboratory
Devin Wesenberg: University of Denver
Kevin S. Mistry: Chemistry and Nanoscience Center, National Renewable Energy Laboratory
Sarah L. Guillot: Chemistry and Nanoscience Center, National Renewable Energy Laboratory
Barry L. Zink: University of Denver
Yong-Hyun Kim: Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology
Jeffrey L. Blackburn: Chemistry and Nanoscience Center, National Renewable Energy Laboratory
Andrew J. Ferguson: Chemistry and Nanoscience Center, National Renewable Energy Laboratory

Nature Energy, 2016, vol. 1, issue 4, 1-9

Abstract: Abstract Thermoelectric power generation, allowing recovery of part of the energy wasted as heat, is emerging as an important component of renewable energy and energy efficiency portfolios. Although inorganic semiconductors have traditionally been employed in thermoelectric applications, organic semiconductors garner increasing attention as versatile thermoelectric materials. Here we present a combined theoretical and experimental study suggesting that semiconducting single-walled carbon nanotubes with carefully controlled chirality distribution and carrier density are capable of large thermoelectric power factors, higher than 340 μW m−1 K−2, comparable to the best-performing conducting polymers and larger than previously observed for carbon nanotube films. Furthermore, we demonstrate that phonons are the dominant source of thermal conductivity in the networks, and that our carrier doping process significantly reduces the thermal conductivity relative to undoped networks. These findings provide the scientific underpinning for improved functional organic thermoelectric composites with carbon nanotube inclusions.

Date: 2016
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DOI: 10.1038/nenergy.2016.33

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