Morandi Vittorio, Ortolani Luca, Migliori Andrea, Degli Esposti Boschi Cristian, Cadelano Emiliano, Colombo Luciano
CNR-IMM Bologna, via Gobetti 101, I-40129, Bologna, Italy,
Top Curr Chem. 2014;348:205-36. doi: 10.1007/128_2013_451.
The elastic properties of graphene crystals have been extensively investigated, revealing unique properties in the linear and nonlinear regimes, when the membranes are under either stretching or bending loading conditions. Nevertheless less knowledge has been developed so far on folded graphene membranes and ribbons. It has been recently suggested that fold-induced curvatures, without in-plane strain, can affect the local chemical reactivity, the mechanical properties, and the electron transfer in graphene membranes. This intriguing perspective envisages a materials-by-design approach through the engineering of folding and bending to develop enhanced nano-resonators or nano-electro-mechanical devices. Here we present a novel methodology to investigate the mechanical properties of folded and wrinkled graphene crystals, combining transmission electron microscopy mapping of 3D curvatures and theoretical modeling based on continuum elasticity theory and tight-binding atomistic simulations.
石墨烯晶体的弹性特性已得到广泛研究，揭示了在膜处于拉伸或弯曲加载条件下，线性和非线性状态下的独特特性。然而，到目前为止，对于折叠石墨烯膜和带的了解还较少。最近有人提出，在没有面内应变的情况下，折叠引起的曲率会影响石墨烯膜中的局部化学反应性、机械性能和电子转移。这种有趣的观点设想了一种通过折叠和弯曲工程来开发增强型纳米谐振器或纳米机电装置的材料设计方法。在这里，我们提出了一种新颖的方法来研究折叠和起皱石墨烯晶体的机械性能，该方法结合了三维曲率的透射电子显微镜映射以及基于连续弹性理论和紧束缚原子模拟的理论建模。
