Case study on length dependence of thermal conductivity of GNRs

Publish Year: 1397
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

CARSE03_046

تاریخ نمایه سازی: 18 خرداد 1398

Abstract:

The relative contribution to heat conduction by different phonon branches is still an intriguing and open question in phonon transport of graphene nanoribbons. By incorporating the direction dependent phonon–boundary scattering into the linearized phonon Boltzmann transport equation, we find that because of lower Grüneisen parameter, The TA phonons have the major contribution to thermal conductivity of GNRs, and in the case of smooth edge and micron–length of GNRS, the relative contribution of TA branch to thermal conductivity is over ۵۰%. The length and edge roughness of GNRs have distinct influences on the relative contribution of different polarization branches to thermal conductivity. The contribution of TA branch to thermal conductivity increases with increasing the length or decreasing the edge roughness of GNRs.On the contrary, the contribution of ZA branch to thermal conductivity increases with decreasing the length or increasing the edge roughness of GNRs. The contribution of LA branch is length and roughness insensitive.

Authors

Mohammad Hosein Sahafi

Department of Physics, Faculty of Science, University of Mazandaran, babolsar, Iran

Erfan Cholaki

Department of Physics, Faculty of Science, Islamic Azad University of Kermanshah branch, Kermanshah

Sajad Ahmadvand

Department of Civil Engineering, faculty of Engineering, Islamic Azad University of harsin branch, Iran