Suppressed Thermal Conductivity of Bilayer Graphene with Vacancy-Initiated Linkages

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• 作者：Haifei Zhan ; Yingyan Zhang ; John M. Bell ; Yuantong Gu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：January 29, 2015
• 年：2015
• 卷：119
• 期：4
• 页码：1748-1752
• 全文大小：326K
• ISSN：1932-7455

文摘

Through larger-scale molecular dynamics simulations, we investigated the impacts from vacancy-initiated linkages on the thermal conductivity of bilayer graphene sheets (of size L 脳 W = 24.5 nm 脳 3.7 nm). Three different interlayer linkages, including divacancy bridging, 鈥渟piro鈥?interstitial bridging and Frenkel pair defects, are considered. It is found that the presence of interlayer linkages induces a significant degradation in the thermal conductivity of the bilayer graphene sheet. The degradation is strongly dependent on the interlayer linkage type, concentration and location. More importantly, the linkages that contain vacancies lead to more severe suppression of the thermal conductivity, in agreement with theoretical predictions that vacancies induce strong phonon scattering. Our finding provides useful guidelines for the application of multilayer graphene sheets in practical thermal management.