| Issue |
EPL
Volume 123, Number 4, August 2018
|
|
|---|---|---|
| Article Number | 44004 | |
| Number of page(s) | 5 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/123/44004 | |
| Published online | 21 September 2018 | |
Enhancing thermal rectification in graphene-carbon nanotube junctions by tuning the chirality of pillar
1 Department of Power Engineering, North China Electric Power University - Baoding 071003, China
2 Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University - Beijing 100084, China
(a) xuemingyang@ncepu.edu.cn (corresponding author)
(b) caoby@tsinghua.edu.cn (corresponding author)
Received: 25 June 2018
Accepted: 27 August 2018
This letter investigates thermal rectification (TR) in graphene-carbon nanotube (GN-CNT) junctions formed by SWCNT(12, 12) connected with a single-layer graphene nanosheet (GN-SWCNT(12, 12)). It is found that the TR ratio of GN-SWCNT junction can be enhanced dramatically by tuning the chirality of the pillar. TR ratio of the GN-SWCNT(12, 12) junction can respectively reach up to 1487% and 2586.4% at temperatures of 300 K and 200 K 
, much higher than those previously reported for the pillared graphene and GN-CNT junctions. The influences of the geometric parameters on the thermal rectification are discussed. The results could offer useful guidelines to the design and performance improvement of the GN-CNT–based thermal rectifier.
PACS: 44.10.+i – Heat conduction / 65.80.-g – Thermal properties of small particles, nanocrystals, nanotubes, and other related systems / 63.22.-m – Phonons or vibrational states in low-dimensional structures and nanoscale materials
© EPLA, 2018
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