文章基本信息

标题：A Bond-order Theory on the Phonon Scattering by Vacancies in Two-dimensional Materials
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作者：Guofeng Xie ; Yulu Shen ; Xiaolin Wei 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：4
期号：1
DOI：10.1038/srep05085
语种：English
出版社：Springer Nature
摘要：We theoretically investigate the phonon scattering by vacancies, including the impacts of missing mass and linkages ( ) and the variation of the force constant of bonds associated with vacancies ( ) by the bond-order-length-strength correlation mechanism. We find that in bulk crystals, the phonon scattering rate due to change of force constant is about three orders of magnitude lower than that due to missing mass and linkages . In contrast to the negligible in bulk materials, in two-dimensional materials can be 3–10 folds larger than . 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.