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Fracture of polycrystalline graphene membranes by in situ nanoindentation in a scanning electron microscope |
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| Authors: | Ji Won Suk Vladimir Mancevski Yufeng Hao Kenneth M. Liechti Rodney S. Ruoff |
| Affiliation: | 1. School of Mechanical Engineering, Sungkyunkwan University, Suwon, Republic of Korea;2. Xidex Corporation, Austin, Texas, USA;3. Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas, USA;4. Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas, USA;5. Institute of Basic Sciences Center for Multidimensional Carbon Materials &Department of Chemistry and School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea |
| Abstract: | Failure of polycrystalline graphene grown by chemical vapor deposition was investigated by nanoindentation in a scanning electron microscope. Circular graphene membranes were subject to central point loads using a nanomanipulator combined with an atomic force microscope cantilever as a force sensor. The grain boundaries of the polycrystalline graphene were visualized by Raman spectroscopy coupled with a carbon isotope labeling technique. Graphene membranes without any grain boundary had a failure strength of 45.4 ± 10.4 GPa, compared to 16.4 ± 5.1 GPa for those with grain boundaries when a Young's modulus was assumed to be 1 TPa. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) |
| Keywords: | graphene chemical vapor deposition nanoindentation failure grain boundaries |