کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7056720 | 1458057 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the origin of abnormal phonon transport of graphyne
ترجمه فارسی عنوان
بر مبنای انتقال فونون غیر طبیعی از گرافین
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Graphyne, a two-dimensional planar carbon allotrope and consisting of sp and sp2 carbon atoms, receives great attention in a wide community of scientists and engineers beyond graphene. Herewith we investigate the thermal transport property of graphyne and graphyne nanoribbons by performing nonequilibrium molecular dynamics simulation. Our simulations reveal abnormal thermal transport in graphyne that exhibits a low thermal conductivity (as low as 8Â W/mK at room temperature), which is two to three orders of magnitude lower as compared to graphene. Detailed lattice dynamic calculations and phonon polarization analysis suggest that, the intrinsically low thermal conductivity of graphyne originates from the localization and the domination of the low frequency in-plan longitudinal modes to the acetylenic linkages and the large lattice vibration mismatch between the linkages and the hexagonal rings, which induces inefficient energy transfer between the soft phonon modes in the linkages and the stiffer vibrational modes in the hexagonal rings. We also illustrated an intriguing width dependent thermal conductivity of graphyne nanoribbons, which is fundamentally different from that of graphene nanoribbons and stems from the surface dominated phonon modes presented in the graphyne edge. Our simulations provide a detailed physical picture of thermal transport in graphyne and could offer useful guidance for engineering the thermal transport properties of graphyne for applications of graphyne related devices such as thermoelectrics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 85, June 2015, Pages 880-889
Journal: International Journal of Heat and Mass Transfer - Volume 85, June 2015, Pages 880-889
نویسندگان
Yuhang Jing, Ming Hu, Yufei Gao, Licheng Guo, Yi Sun,