Chemically doped macroscopic graphene fibers with significantly enhanced thermoelectric properties

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 extr...

Full description

Saved in:
Bibliographic Details
Published inNano research Vol. 11; no. 2; pp. 741 - 750
Main Authors Ma, Weigang, Liu, Yingjun, Yan, Shen, Miao, Tingting, Shi, Shaoyi, Xu, Zhen, Zhang, Xing, Gao, Chao
Format Journal Article
LanguageEnglish
Published Beijing Tsinghua University Press 01.02.2018
Subjects
Assemblies
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Bromine
Carbon nanotubes
Chemistry and Materials Science
Condensed Matter Physics
Doping
Electrical conductivity
Electrical resistivity
Energy harvesting
Fibers
Figure of merit
Graphene
Heat conductivity
Heat transfer
Materials Science
Mechanical properties
Nanotechnology
Nanotubes
Power factor
Research Article
Seebeck effect
Thermal conductivity
Thermoelectricity
Wearable technology
性质;热电;纤维;宏观;化学;热传导性;应用程序;温度范围
Seebeck coefficient
bromine doping
thermal conductivity
electrical conductivity
thermoelectric properties
macroscopic graphene fiber
Online AccessGet full text

Cover

More Information
Summary: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~, 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 btW.m-l.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.
Bibliography:macroscopic graphene fiber,bromine doping,thermoelectric properties,thermal conductivity,electrical conductivity,Seebeck coefficient
11-5974/O4
Weigang Ma, Yingjun Liu2, Shen Yan, Tingting Miao4, Shaoyi Shi1, Zhen Xu2, Xing Zhang, and Chao Gao2 （ 1 Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China 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 3 Department of Thermal Engineering, Tsinghua University, Beijing 100084, China Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China Weigang Ma, Yingjun Liu, and Shen Yan contributed equally to this work.）
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~, 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 btW.m-l.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.
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-017-1683-3