Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3703756
Keywords
diffusion; graphene; molecular dynamics method; nanoribbons; phonons; rectification; thermal conductivity; vacancies (crystal)
Categories
Funding
- Air Force Office of Scientific Research (AFOSR)
- Cooling Technologies Research Center, an NSF Industry & University Cooperative Research Center
Ask authors/readers for more resources
Using non-equilibrium molecular dynamics, we show that asymmetrically defected graphene nanoribbons (GNR) are promising thermal rectifiers. The optimum conditions for thermal rectification (TR) include low temperature, high temperature bias, similar to 1% concentration of single-vacancy or substitutional silicon defects, and a moderate partition of the pristine and defected regions. TR ratio of similar to 80% is found in a 14-nm long and 4-nm wide GNR at a temperature of 200 K and bias of 90 K, where heat conduction is in the ballistic regime since the bulk effective phonon mean-free-path is around 775 nm. As the GNR length increases towards the diffusive regime, the TR ratio decreases and eventually stabilizes at a length-independent value of about 3%-5%. This work extends defect engineering to 2D materials for achieving TR. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3703756]
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available