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Nano Research 2018, 11(2): 741-750 https://doi.org/10.1007/s12274-017-1683-3
Research Article | Issue | Published: 19 August 2017

Chemically doped macroscopic graphene fibers with significantly enhanced thermoelectricproperties

Show Author's Information Weigang Ma1,§,  Yingjun Liu2,§,  Shen Yan1,3,§,  Tingting Miao4,  Shaoyi Shi1,  Zhen Xu2,  Xing Zhang1( ),  Chao Gao2( )
Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationDepartment of Engineering MechanicsTsinghua UniversityBeijing100084China
MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou310027China
Department of Thermal EngineeringTsinghua UniversityBeijing100084China
Key Laboratory of Process Fluid Filtration and SeparationCollege of Mechanical and Transportation EngineeringChina University of Petroleum-BeijingBeijing102249China

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

Keywords:
thermal conductivity, electrical conductivity, Seebeck coefficient, thermoelectric properties, macroscopic graphene fiber, bromine doping
Cite this article:
Ma W, Liu Y, Yan S, et al. Chemically doped macroscopic graphene fibers with significantly enhanced thermoelectricproperties. Nano Research, 2018, 11(2): 741-750. https://doi.org/10.1007/s12274-017-1683-3
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Abstract Full text About this article

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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About this article

Chemically doped macroscopic graphene fibers with significantly enhanced thermoelectricproperties

Show Author's information Weigang Ma1,§, Yingjun Liu2,§, Shen Yan1,3,§, Tingting Miao4, Shaoyi Shi1, Zhen Xu2, Xing Zhang1( ), Chao Gao2( )
Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationDepartment of Engineering MechanicsTsinghua UniversityBeijing100084China
MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou310027China
Department of Thermal EngineeringTsinghua UniversityBeijing100084China
Key Laboratory of Process Fluid Filtration and SeparationCollege of Mechanical and Transportation EngineeringChina University of Petroleum-BeijingBeijing102249China

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

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.

Keywords: thermal conductivity, electrical conductivity, Seebeck coefficient, thermoelectric properties, macroscopic graphene fiber, bromine doping

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Publication history
Copyright
Acknowledgements

Publication history

Received: 21 February 2017
Revised: 08 May 2017
Accepted: 16 May 2017
Published: 19 August 2017
Issue date: February 2018

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany 2017

Acknowledgements

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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