Theoretical study of anisotropy and ultra-low thermal conductance of porous graphene nanoribbons

被引：3
|
作者：
Wu Cheng-Wei [1 ,2 ]
Ren Xue [1 ,2 ]
Zhou Wu-Xing [1 ,2 ]
Xie Guo-Feng [1 ,2 ]
机构：
[1] Hunan Univ Sci & Technol, Sch Mat Sci & Engn, Xiangtan 411201, Peoples R China
[2] Hunan Univ Sci & Technol, Hunan Prov Key Lab Adv Mat New Energy Storage & C, Xiangtan 411201, Peoples R China
来源：
ACTA PHYSICA SINICA | 2022年 / 71卷 / 02期
基金：
中国国家自然科学基金;
关键词：
porous graphene; phonon localization; thermal conductance; non-equilibrium Green's function; THERMOELECTRIC PERFORMANCE; CONDUCTIVITY; ENHANCEMENT; BANDGAP;
D O I：
10.7498/aps.71.20211477
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The thermal transport properties of porous graphene nanoribbons are studied by the non-equilibrium Green's function method. The results show that owing to the existence of nano-pores, the thermal conductance of porous graphene nanoribbons is much lower than that of graphene nanoribbons. At room temperature, the thermal conductance of zigzag porous graphene nanoribbons is only 12% of that of zigzag graphene nanoribbons of the same size. This is due to the phonon localization caused by the nano-pores in the porous graphene nanoribbons. In addition, the thermal conductance of porous graphene nanoribbons has remarkable anisotropy. With the same size, the thermal conductance of armchair porous graphene nanoribbons is about twice higher than that of zigzag porous graphene nanoribbons. This is because the phonon locality in the zigzag direction is stronger than that in the armchair direction, and even part of the frequency phonons are completely localized.
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页数：7
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