Size and edge roughness dependence of thermal conductivity for vacancy-defective graphene ribbons
| Autor: | Guofeng Xie, Yulu Shen |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Condensed matter physics Condensed Matter::Other Phonon Scattering Graphene General Physics and Astronomy Surface finish Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Boltzmann equation law.invention Condensed Matter::Materials Science Thermal conductivity law Condensed Matter::Superconductivity Vacancy defect Physics::Atomic and Molecular Clusters Physical and Theoretical Chemistry Graphene nanoribbons |
| Zdroj: | Physical Chemistry Chemical Physics. 17:8822-8827 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/c5cp00335k |
| Popis: | By incorporating the phonon-phonon scattering, phonon-boundary scattering and phonon-vacancy scattering into the linearized Boltzmann transport equation, we theoretically investigate the effects of size and edge roughness on thermal conductivity of single vacancy-defective graphene ribbons. Due to the severe suppression of high-frequency phonons by phonon-vacancy scattering which includes the impacts of missing mass and linkages, as well as the variation of the force constant of bonds associated with vacancies, the low-frequency ballistic phonons have a higher contribution to the thermal conductivity, which results in the stronger length, weaker width and weaker edge roughness dependence on thermal conductivity of vacancy-defective graphene ribbons than that of pristine ones. Our findings are helpful to understand and manipulate thermal conductivity of graphene by phononic engineering. |
| Databáze: | OpenAIRE |
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