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- Title
A Bond-order Theory on the Phonon Scattering by Vacancies in Two-dimensional Materials.
- Authors
Guofeng Xie; Yulu Shen; Xiaolin Wei; Liwen Yang; Huaping Xiao; Jianxin Zhong; Gang Zhang
- Abstract
We theoretically investigate the phonon scattering by vacancies, including the impacts of missing mass and linkages (τv-1) and the variation of the force constant of bonds associated with vacancies (τA-1) by the bond-order-length-strength correlation mechanism. We find that in bulk crystals, the phonon scattering rate due to change of force constant τA-1 is about three orders of magnitude lower than that due to missing mass and linkages τv-1 . In contrast to the negligible τA-1 in bulk materials, τA-1 in two-dimensional materials can be 3-10 folds larger than τv-1. Incorporating this phonon scattering mechanism to the Boltzmann transport equation derives that the thermal conductivity of vacancy defective graphene is severely reduced even for very low vacancy density. High-frequency phonon contribution to thermal conductivity reduces substantially. Our findings are helpful not only to understand the severe suppression of thermal conductivity by vacancies, but also to manipulate thermal conductivity in two-dimensional materials by phononic engineering.
- Subjects
PHONON scattering; MISSING mass problem (Astronomy); MOLECULAR force constants; BOLTZMANN'S equation; TRANSPORT theory; THERMAL conductivity
- Publication
Scientific Reports, 2014, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep05085