Softened Elastic Response and Unzipping in Chemical Vapor Deposition Graphene Membranes

作者：Carlos Ruiz‐Vargas, Houlong L. Zhuang, Pinshane Y. Huang, Arend M. van der Zande, Shivank Garg, Paul L. McEuen, David Anthony Muller, Richard G. Hennig, Jiwoong Park · 发表于：Nano Letters · 年份：2011 · DOI：10.1021/nl200429f · 被引用次数：372 · 研究领域：Graphene research and applications、Graphene and Nanomaterials Applications、Membrane Separation Technologies

We use atomic force microscopy to image grain boundaries and ripples in graphene membranes obtained by chemical vapor deposition. Nanoindentation measurements reveal that out-of-plane ripples effectively soften graphene's in-plane stiffness. Furthermore, grain boundaries significantly decrease the breaking strength of these membranes. Molecular dynamics simulations reveal that grain boundaries are especially weakening when subnanometer voids are present in the lattice. Finally, we demonstrate that two graphene membranes brought together form membranes with higher resistance to breaking.