The influence of tilt grain boundaries on the mechanical properties of bicrystalline graphene nanoribbons |
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| Institution: | 1. Tianjin Key Laboratory of Modern Engineering Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China;2. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China;1. Physics Department, Faculty of Science and Science Education, School of Science, University of Sulaimani, Kurdistan Region, Iraq;2. Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland;3. Department of Mechanical Engineering, National United University, 1, Lienda, Miaoli 36003, Taiwan;4. School of Science and Engineering, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland;1. Physics Department, Belarusian State University, pr. Nezavisimosti 4, Minsk 220030, Belarus;2. Institute for Spectroscopy Russian Academy of Science, Fizicheskaya Str. 5, Troitsk, 142190 Moscow, Russia;3. Moscow Institute of Physics and Technology, Institutskii pereulok 9, Dolgoprudny, 141700 Moscow region, Russia;1. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China;2. College of Optical and Electronic technology, China Jiliang University, Hangzhou, 310018, China;1. College of Physics and Electronics, Shandong Normal University, Jinan 250014, China;2. School of Physics, Shandong University, Jinan 250100, China;1. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, 660036 Krasnoyarsk, Russia;2. Siberian Federal University, Svobodny Prospect 79, 660041 Krasnoyarsk, Russia;3. Reshetnev Siberian State Aerospace University, Krasnoyarsk Worker 31, 660014 Krasnoyarsk, Russia |
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| Abstract: | The mechanical properties of bicrystalline graphene nanoribbons with various tilt grain boundaries (GBs) which typically consist of repeating pentagon–heptagon ring defects are investigated based on the method of molecular structural mechanics. The GB models are constructed via the theory of disclinations in crystals, and the elastic properties and ultimate strength of bicrystalline graphene nanoribbons are calculated under uniaxial tensile loads in perpendicular and parallel directions to grain boundaries. The dependence of mechanical properties is analyzed on the chirality and misorientation angles of graphene nanoribbons, and the experimental phenomena that Young's modulus and ultimate strength of bicrystalline graphene nanoribbons can either increase or decrease with the grain boundary angles are further verified and discussed. In addition, the influence of GB on the size effects of graphene Young's modulus is also analyzed. |
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| Keywords: | Bicrystalline graphene Grain boundary Young's modulus Ultimate strength |
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