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Chemically doped macroscopic graphene fibers with significantly enhanced thermoelectric properties

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Abstract

Flexible wearable electronics, when combined with outstanding thermoelectric properties, are promising candidates for future energy harvesting systems. Graphene and its macroscopic assemblies (e.g., graphene-based fibers and films) have thus been the subject of numerous studies because of their extraordinary electrical and mechanical properties. However, these assemblies have not been considered suitable for thermoelectric applications owing to their high intrinsic thermal conductivity. In this study, bromine doping is demonstrated to be an effective method for significantly enhancing the thermoelectric properties of graphene fibers. Doping enhances phonon scattering due to the increased defects and thus decreases the thermal conductivity, while the electrical conductivity and Seebeck coefficient are increased by the Fermi level downshift. As a result, the maximum figure of merit is 2.76 × 10–3, which is approximately four orders of magnitude larger than that of the undoped fibers throughout the temperature range. Moreover, the room temperature power factor is shown to increase up to 624 μW·m–1·K–2, which is higher than that of any other material solely composed of carbon nanotubes and graphene. The enhanced thermoelectric properties indicate the promising potential for graphene fibers in wearable energy harvesting systems.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51576105, 51406236 51327001, 51336009, 21325417, and 51533008), National Key R&D Program of China (No. 2016YFA0200200), the Science Fund for Creative Research Groups (No. 51621062), Tsinghua University Initiative Scientific Research Program, and the National Postdoctoral Program for Innovative Talents (No. BX201700209).

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  1. Weigang Ma, Yingjun Liu, and Shen Yan contributed equally to this work.

Authors and Affiliations

  1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China

    Weigang Ma, Shen Yan, Shaoyi Shi & Xing Zhang

  2. MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, Hangzhou, 310027, China

    Yingjun Liu, Zhen Xu & Chao Gao

  3. Department of Thermal Engineering, Tsinghua University, Beijing, 100084, China

    Shen Yan

  4. Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing, 102249, China

    Tingting Miao

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  1. Weigang Ma
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Ma, W., Liu, Y., Yan, S. et al. Chemically doped macroscopic graphene fibers with significantly enhanced thermoelectric properties. Nano Res. 11, 741–750 (2018). https://doi.org/10.1007/s12274-017-1683-3

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