Macroscopic weavable fibers of carbon nanotubes with giant thermoelectric power factor.
Natsumi Komatsu,Yota Ichinose,Oliver S. Dewey,Lauren W. Taylor,Mitchell A. Trafford,Yohei Yomogida,Geoff Wehmeyer,Matteo Pasquali,Kazuhiro Yanagi,Junichiro Kono +9 more
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TLDR
In this article, a textile thermoelectric generator based on carbon nanotube fibers is presented, which achieves a power factor of 14.5 µmW/mW 1 µm−1 µw/k−2 µw.Abstract:
Low-dimensional materials have recently attracted much interest as thermoelectric materials because of their charge carrier confinement leading to thermoelectric performance enhancement. Carbon nanotubes are promising candidates because of their one-dimensionality in addition to their unique advantages such as flexibility and light weight. However, preserving the large power factor of individual carbon nanotubes in macroscopic assemblies has been challenging, primarily due to poor sample morphology and a lack of proper Fermi energy tuning. Here, we report an ultrahigh value of power factor (14 ± 5 mW m−1 K−2) for macroscopic weavable fibers of aligned carbon nanotubes with ultrahigh electrical and thermal conductivity. The observed giant power factor originates from the ultrahigh electrical conductivity achieved through excellent sample morphology, combined with an enhanced Seebeck coefficient through Fermi energy tuning. We fabricate a textile thermoelectric generator based on these carbon nanotube fibers, which demonstrates high thermoelectric performance, weavability, and scalability. The giant power factor we observe make these fibers strong candidates for the emerging field of thermoelectric active cooling, which requires a large thermoelectric power factor and a large thermal conductivity at the same time. Preserving the large power factor of carbon nanotubes is challenging, due to poor sample morphology and a lack of proper Fermi energy tuning. Here, the authors achieve a value of power factor of 14 ± 5 mW m−1 K−2 originating from the preserved conductivity and the ability to tune Fermi energy.read more
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References
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High-Thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys
Bed Poudel,Qing Hao,Yi Ma,Yucheng Lan,Austin J. Minnich,Bo Yu,Xiao Yan,Dezhi Wang,Andrew Muto,Daryoosh Vashaee,Xiaoyuan Chen,Jun-Ming Liu,Mildred S. Dresselhaus,Gang Chen,Zhifeng Ren +14 more
TL;DR: Electrical transport measurements, coupled with microstructure studies and modeling, show that the ZT improvement is the result of low thermal conductivity caused by the increased phonon scattering by grain boundaries and defects, which makes these materials useful for cooling and power generation.
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Thermoelectric figure of merit of a one-dimensional conductor.
TL;DR: Calculations show that this approach has the potential to achieve a significant increase in the figure of merit over both the bulk value and the calculated two-dimensional superlattice values.
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The best thermoelectric.
Gerald D. Mahan,Jorge O. Sofo +1 more
TL;DR: A delta-shaped transport distribution is found to maximize the thermoelectric properties, indicating that a narrow distribution of the energy of the electrons participating in the transport process is needed for maximum thermoelectedric efficiency.
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Strong, Light, Multifunctional Fibers of Carbon Nanotubes with Ultrahigh Conductivity
Natnael Behabtu,Colin C. Young,Dmitri E. Tsentalovich,Olga Kleinerman,Xuan Wang,Anson W. K. Ma,E. Amram Bengio,E. Amram Bengio,Ron F. ter Waarbeek,De Jong Jorrit,Ron E. Hoogerwerf,Steven B. Fairchild,John B. Ferguson,Benji Maruyama,Junichiro Kono,Yeshayahu Talmon,Yachin Cohen,Marcin Jan Otto,Matteo Pasquali +18 more
TL;DR: High-performance multifunctional carbon nanotube (CNT) fibers that combine the specific strength, stiffness, and thermal conductivity of carbon fibers with the specific electrical Conductivity of metals are reported.