Structure of Polycrystalline Graphene (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Polycrystalline graphene contains inherent nanoscale line and point defects that lead to significant statistical fluctuations in toughness and strength. Credit Berkeley Lab Usage Restrictions Credit Berkeley Lab License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.