Mechanisms governing phonon scattering by topological defects in graphene nanoribbons

Zhu, Ziming1; Yang, Xiaolong1; Huang, Mingyuan2; He, Qingfeng3; Yang, Guang4,5; Wang, Zhao6

2016-02-05

10.1088/0957-4484/27/5/055401

NANOTECHNOLOGY   影响因子和分区

0957-4484

1361-6528

Understanding phonon scattering by topological defects in graphene is of particular interest for thermal management in graphene-based devices. We present a study that quantifies the roles of the different mechanisms governing defect phonon scattering by comparing the effects of ten different defect structures using molecular dynamics. Our results show that phonon scattering is mainly influenced by mass density difference, with general trends governed by the defect formation energy and typical softening behaviors in the phonon density of state. The phonon scattering cross-section is found to be far larger than that geometrically occupied by the defects. We also show that the lattice thermal conductivity can be reduced by a factor of up to similar to 30 in the presence of the grain boundaries formed by these defects.

thermal transport graphene defect phonon scattering

SCI ; EI

英语

其他

National Basic Research Program of China[2012CB619402] ; National Basic Research Program of China[2014CB644003]

Science & Technology - Other Topics ; Materials Science ; Physics

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000368894300008

IOP PUBLISHING LTD

20160301829333

Defect density ; Defects ; Grain boundaries ; Graphene ; Molecular dynamics ; Nanoribbons ; Phonon scattering ; Thermal conductivity ; Topology

Thermodynamics:641.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Crystalline Solids:933.1 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Xian 710049, Peoples R China
2.South Univ Sci & Technol China, Dept Phys, Shenzhen, Peoples R China
3.Hunan Univ, Dept Civil Engn, Changsha 410082, Hunan, Peoples R China
4.Xi An Jiao Tong Univ, Elect Mat Res Lab, Key Lab, Minist Educ, Xian 710049, Peoples R China
5.Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Peoples R China
6.Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, State Key Lab Mech Behav Mat, Xian 710054, Peoples R China

Zhu, Ziming,Yang, Xiaolong,Huang, Mingyuan,et al. Mechanisms governing phonon scattering by topological defects in graphene nanoribbons[J]. NANOTECHNOLOGY,2016,27(5).

Zhu, Ziming,Yang, Xiaolong,Huang, Mingyuan,He, Qingfeng,Yang, Guang,&Wang, Zhao.(2016).Mechanisms governing phonon scattering by topological defects in graphene nanoribbons.NANOTECHNOLOGY,27(5).

Zhu, Ziming,et al."Mechanisms governing phonon scattering by topological defects in graphene nanoribbons".NANOTECHNOLOGY 27.5(2016).