Direct Nanoscale Imaging of Ballistic and Diffusive Thermal Transport in Graphene Nanostructures

被引：79
|
作者：
Pumarol, Manuel E. [1 ]
Rosamond, Mark C. [2 ]
Tovee, Peter [1 ]
Petty, Michael C. [2 ]
Zeze, Dagou A. [2 ]
Falko, Vladimir [1 ]
Kolosov, Oleg V. [1 ]
机构：
[1] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England
[2] Univ Durham, Sch Engn & Comp Sci, Durham DH1 3LE, England
来源：
NANO LETTERS | 2012年 / 12卷 / 06期
基金：
英国工程与自然科学研究理事会;
关键词：
Nanoscale thermal transport; nanoscale imaging; ballistic phonons; thermal conductivity; graphene; scanning thermal microscopy; HEAT-CONDUCTION; MICROSCOPY;
D O I：
10.1021/nl3004946
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We report direct imaging of nanoscale thermal transport in single and few-layer graphene with approximately 50 nm lateral resolution using high vacuum scanning thermal microscopy. We observed increased heat transport in suspended graphene where heat is conducted by ballistic phonons, compared to adjacent areas of supported graphene, and observed decreasing thermal conductance of supported graphene with increased layer number. Our nanothermal images suggest a mean-free-path of thermal phonons in supported graphene below 100 nm.
引用
收藏
页码：2906 / 2911
页数：6
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