Coherent and incoherent effects of nanopores on thermal conductance in silicene

doi:10.1016/j.ijthermalsci.2021.107009

	Coherent and incoherent effects of nanopores on thermal conductance in silicene
	Cui, Liu 1; Wei, Gaosheng 1; Li, Zhao 1; Ma, Jingjian 1; Du, Xiaoze 1,2
	2021-09
发表期刊	International Journal of Thermal Sciences
ISSN	1290-0729
卷号	167
摘要	A fundamentally new approach of manipulating thermal properties is utilizing the wave nature of phonons, which can be realized by introducing secondary artificial periodicity in nanostructures. In this paper, we have studied the heat transport in silicene nanomesh (SNM, a silicene sheet with periodically arranged nanopores), using first-principles calculations and molecular dynamics simulations. The results show the thermal conductivity of SNM is obviously lower than that of silicene. Combining with the analysis of wave and particle characteristics of phonons, we reveal the main reasons responsible for the reduction in thermal conductivity of SNM. The coherent Bragg scattering from the secondary artificial periodicity leads to the reduction in phonon group velocities of LA and optical phonons. Different from the graphene nanomesh reported previously, multiple phonon bandgaps in the optical phonon spectrum of SNM are found for the first time. Moreover, it is noticed that, phonons are scattered not only at the hole boundaries, but also at the interface between the surface and interfacial regions in SNMs. In particular, the out-of-plane vibrations are easier to be scattered at the interface than the in-plane vibrations. This study uncovers the coherent and incoherent phonon transport in SNMs, which would deepen our understanding on heat conduction and shed light on the development of Si-based nanoelectronic devices. © 2021 Elsevier Masson SAS
关键词	Calculations Coherent scattering Heat conduction Metamaterials Molecular dynamics Nanopores Phonons Silicene Thermal conductivity % reductions Artificial periodicity First principles Nanomesh New approaches Optical phonons Phonon bandgap Silicene Thermal Thermal conductance
DOI	10.1016/j.ijthermalsci.2021.107009
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Thermodynamics ; Engineering
WOS类目	Thermodynamics ; Engineering, Mechanical
WOS记录号	WOS:000656893800001
出版者	Elsevier Masson s.r.l.
EI入藏号	20211810295619
EI主题词	Energy gap
EI分类号	641.1 Thermodynamics ; 641.2 Heat Transfer ; 711 Electromagnetic Waves ; 761 Nanotechnology ; 801.4 Physical Chemistry ; 921 Mathematics ; 933 Solid State Physics ; 951 Materials Science
来源库	WOS
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/148390
专题	兰州理工大学
通讯作者	Cui, Liu; Du, Xiaoze
作者单位	1.North China Elect Power Univ, Key Lab Power Stn Energy Transfer Convers & Syst, Sch Energy Power & Mech Engn, Minist Educ, Beijing 102206, Peoples R China; 2.Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China
通讯作者单位	能源与动力工程学院
推荐引用方式 GB/T 7714	Cui, Liu,Wei, Gaosheng,Li, Zhao,et al. Coherent and incoherent effects of nanopores on thermal conductance in silicene[J]. International Journal of Thermal Sciences,2021,167.
APA	Cui, Liu,Wei, Gaosheng,Li, Zhao,Ma, Jingjian,&Du, Xiaoze.(2021).Coherent and incoherent effects of nanopores on thermal conductance in silicene.International Journal of Thermal Sciences,167.
MLA	Cui, Liu,et al."Coherent and incoherent effects of nanopores on thermal conductance in silicene".International Journal of Thermal Sciences 167(2021).