Thermal Transport in Graphene Nanomesh: Unraveling the Role of Brillouin Zone Folding, Phonon Localization and Phonon Confinement

doi:10.1016/j.ijheatmasstransfer.2020.120685

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	Thermal Transport in Graphene Nanomesh: Unraveling the Role of Brillouin Zone Folding, Phonon Localization and Phonon Confinement
	Cui, Liu 1; Wei, Gaosheng 1; Li, Zhao 1; Du, Xiaoze 1,2
刊名	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
	2021-02
卷号	165 页码:-
关键词	Calculations Graphene Heat conduction Molecular dynamics Phonons Thermal insulation First-principles calculation Insulation applications Molecular dynamics simulations Optical phonon modes Phonon confinement Phonon dispersions Phonon localization Reduction of thermal conductivity
ISSN号	0017-9310
DOI	10.1016/j.ijheatmasstransfer.2020.120685
英文摘要	Coherent thermal transport has recently become a subject of considerable interest, but whether some intriguing phenomena of phonon coherence (including Brillouin zone folding, phonon localization, and phonon confinement) occur in certain nanostructures remains unclear. We have investigated the thermal transport in graphene nanomesh using molecular dynamics simulations together with first-principles calculations. It is found that the thermal conductivity of nanomesh is significantly reduced compared with graphene, mainly due to the bandgaps, flattened phonon dispersions and reduced phonon group velocities induced by Brillouin zone folding. Meanwhile, the significant decrease in thermal conductivity is induced by phonon localization. Phonon confinement caused by reflecting the optical phonon modes back into the C-H part further leads to the reduction of thermal conductivity. We highlight the coherent mechanism for lowering thermal conductivity, which is useful for manipulating heat conduction for thermoelectrics and thermal insulation applications. (C) 2020 Elsevier Ltd. All rights reserved.
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000596069900058
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/147312]
专题	兰州理工大学
作者单位	1.North China Elect Power Univ, Sch Energy Power & Mech Engn, Key Lab Power Stn Energy Transfer Convers & Syst, Minist Educ, Beijing 102206, Peoples R China; 2.Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Cui, Liu,Wei, Gaosheng,Li, Zhao,et al. Thermal Transport in Graphene Nanomesh: Unraveling the Role of Brillouin Zone Folding, Phonon Localization and Phonon Confinement[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2021,165:-.
APA	Cui, Liu,Wei, Gaosheng,Li, Zhao,&Du, Xiaoze.(2021).Thermal Transport in Graphene Nanomesh: Unraveling the Role of Brillouin Zone Folding, Phonon Localization and Phonon Confinement.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,165,-.
MLA	Cui, Liu,et al."Thermal Transport in Graphene Nanomesh: Unraveling the Role of Brillouin Zone Folding, Phonon Localization and Phonon Confinement".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 165(2021):-.