In this paper, the phonon scattering mechanisms of a single layer graphene are investigated based on the complete phonon dispersion relations. According to the selection rules that a phonon scattering process should obey the energy and momentum conservation conditions, the relaxation rates of combing and splitting Umklapp processes can be calculated by integrating the intersection lines between different phonon mode surfaces in the phonon dispersion relation space. The dependence of the relaxation rates on the wave vector directions is presented with a three dimensional surfaces over the first Brillion zone. It is found that the reason for the optical phonons contributing a little to heat transfer is attributed to the strong Umklapp processes but not to their low group velocities. The combing Umklapp scattering processes involved by the optical phonons mainly decrease the acoustic phonon thermal conductivity, while the splitting Umklapp scattering processes of the optical phonons mainly restrict heat conduction by the optical phonons themselves. Neglecting the splitting processes, the optical phonons can contribute more energy than that carried by the acoustic phonons. Based on the calculated phonon relaxation time, the thermal conductivities contributed from different mode phonons can be evaluated. At low temperatures, both longitudinal and in-plane transverse acoustic phonon thermal conductivities have T2 temperature dependence, and the out-of-plane transverse acoustic phonon thermal conductivity is proportion to T3/2. At room temperature, the calculated thermal conductivity is on the order of a few thousands W/m.K depending on the sample size and the edge roughness, which is in agreement with the recently measured data.
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ASME 2010 International Mechanical Engineering Congress and Exposition
November 12–18, 2010
Vancouver, British Columbia, Canada
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4444-1
PROCEEDINGS PAPER
The Phonon Thermal Conductivity of a Single-Layer Graphene From Complete Phonon Dispersion Relations
Yunfeng Gu,
Yunfeng Gu
Nanjing Forestry University, Nanjing, P.R. China
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Zhonghua Ni,
Zhonghua Ni
Southeast University, Nanjing, P.R. China
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Minhua Chen,
Minhua Chen
Southeast University, Nanjing, P.R. China
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Kedong Bi,
Kedong Bi
Southeast University, Nanjing, P.R. China
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Yunfei Chen
Yunfei Chen
Southeast University, Nanjing, P.R. China
Search for other works by this author on:
Yunfeng Gu
Nanjing Forestry University, Nanjing, P.R. China
Zhonghua Ni
Southeast University, Nanjing, P.R. China
Minhua Chen
Southeast University, Nanjing, P.R. China
Kedong Bi
Southeast University, Nanjing, P.R. China
Yunfei Chen
Southeast University, Nanjing, P.R. China
Paper No:
IMECE2010-39645, pp. 493-501; 9 pages
Published Online:
April 30, 2012
Citation
Gu, Y, Ni, Z, Chen, M, Bi, K, & Chen, Y. "The Phonon Thermal Conductivity of a Single-Layer Graphene From Complete Phonon Dispersion Relations." Proceedings of the ASME 2010 International Mechanical Engineering Congress and Exposition. Volume 7: Fluid Flow, Heat Transfer and Thermal Systems, Parts A and B. Vancouver, British Columbia, Canada. November 12–18, 2010. pp. 493-501. ASME. https://doi.org/10.1115/IMECE2010-39645
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