Nanoscale Graphene Disk: A Natural Functionally Graded Material-How is Fourier's Law Violated along Radius Direction of 2D Disk

被引：29

作者：

Yang, Nuo ^{[1
,2
]}

Hu, Shiqian ^{[3
]}

Ma, Dengke ^{[1
]}

Lu, Tingyu ^{[3
]}

Li, Baowen ^{[4
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Nano Interface Ctr Energy, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Peoples R China

[3] Tongji Univ, Sch Phys Sci & Engn, Ctr Phonon & Thermal Energy Sci, Shanghai 200092, Peoples R China

[4] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

中国国家自然科学基金;

关键词：

DEPENDENT THERMAL-CONDUCTIVITY; HEAT-CONDUCTION; TEMPERATURE; LENGTH;

D O I：

10.1038/srep14878

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In this Paper, we investigate numerically and analytically the thermal conductivity of nanoscale graphene disks (NGDs), and discussed the possibility to realize functionally graded material (FGM) with only one material, NGDs. Different from previous studies on divergence/non-diffusive of thermal conductivity in nano-structures with different size, we found a novel non-homogeneous (graded) thermal conductivity along the radius direction in a single nano-disk structure. We found that, instead of a constant value, the NGD has a graded thermal conductivity along the radius direction. That is, Fourier's law of heat conduction is not valid in two dimensional graphene disk structures Moreover, we show the dependent of NGDs' thermal conductivity on radius and temperature. Our study might inspire experimentalists to develop NGD based versatile FGMs, improve understanding of the heat removal of hot spots on chips, and enhance thermoelectric energy conversion efficiency by two dimensional disk with a graded thermal conductivity.

引用

页数：8