Strong correlation between electrical and thermal transport properties in graphene/graphite films beyond the Wiedemann-Franz law

Han, Meng1; Mao, Dasha2; Liang, Ting3; Gao, Enze1; Bai, Xue1; Zeng, Xiaoliang1; Sun, Rong1,4; Xu, Jianbin3

2022-08-15

10.1016/j.carbon.2022.04.027

CARBON   Impact Factor & Quartile

0008-6223

1873-3891

Due to the unique band structure of graphene, defects in graphene and graphene-based structures often lead to complicated electrical transport properties, even at a very low level. Herein, we found a novel phase transition from semiconducting to metallic behaviors (a negative temperature coefficient of resistance to positive one) along with temperature increase in commercially available graphite/graphene films. Comparison studies on samples from different sources confirm the commonly existed transition in such graphite/graphene-based structures, but with variable transition temperatures ranging from about 320 K to 750 K. Further studies reveal that samples with lower absolute electrical resistance often obtains lower transition temperature, which is related to the defects level that strongly influence the carrier mobilities or concentrations and determines the electrical transport properties, especially at low temperatures. Along with the electrical transport properties, the thermal transport properties are simultaneously characterized from beyond the transition temperatures down to around 90 K. For the first time, an unpredicted linear relation between the transition temperature and the residual thermal reffusivity was observed, which are both strongly correlated to the defects level. The current work shed light on the understanding of electron and phonon transport behaviors and their correlation in graphite/graphene-based structures.

Graphene/graphite films Electrical and thermal transport properties Temperature coefficient of resistance Phase transition

SCI ; EI

English

Others

National Natural Science Foundation of China[52073300] ; Guangdong Basic and Applied Basic Research Foundation[2019A1515012183] ; Guangdong Province Key Field R&D Program Project[2020B010179002] ; Shenzhen Science and Technology Research Fund["JCYJ20200109114401708","JCYJ20180507182530279"]

Chemistry ; Materials Science

Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:000831026300004

PERGAMON-ELSEVIER SCIENCE LTD

20221812044858

Defects ; Graphite ; Polymer films ; Semiconducting films ; Structural properties ; Temperature ; Transport properties

Structural Design:408 ; Thermodynamics:641.1 ; Semiconducting Materials:712.1 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Polymeric Materials:815.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

CHEMISTRY

Web of Science

1.Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen Inst Adv Elect Mat, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Thermoelect Mat, Dept Phys, Shenzhen 518055, Peoples R China
3.Chinese Univ Hong Kong, Dept Elect Engn, Shatin, Hong Kong 999077, Peoples R China
4.Univ Chinese Acad Sci, Shenzhen Coll Adv Technol, Shenzhen 518055, Peoples R China

Han, Meng,Mao, Dasha,Liang, Ting,et al. Strong correlation between electrical and thermal transport properties in graphene/graphite films beyond the Wiedemann-Franz law[J]. CARBON,2022,195:319-327.

Han, Meng.,Mao, Dasha.,Liang, Ting.,Gao, Enze.,Bai, Xue.,...&Xu, Jianbin.(2022).Strong correlation between electrical and thermal transport properties in graphene/graphite films beyond the Wiedemann-Franz law.CARBON,195,319-327.

Han, Meng,et al."Strong correlation between electrical and thermal transport properties in graphene/graphite films beyond the Wiedemann-Franz law".CARBON 195(2022):319-327.