有效拉伸和压缩载荷下的嵌入式三层石墨烯薄片
Embedded trilayer graphene flakes under efficient tensile and compressive loading
摘要：
嵌入ABA三层石墨烯片加载在聚合物梁上的拉伸和压缩的机械响应通过G或2D峰的应变灵敏度通过同时拉曼测量来监测。所研究的薄片的一个特性是它包含三层和双层部分。Bernal堆叠双层用作应变传感器，旨在评估通过剪切从聚合物基质到各个石墨烯层的负载转移的效率。对于处于拉伸状态的三层石墨烯，两个峰都发生了红移，并且首次报道了G峰的分裂。在压缩，所研究的样品是一个几乎孤立的三层，其中两个峰蓝移到一个临界压缩应变。发现该临界应变是在单层石墨烯的情况下发现的值的四分之一，尽管三层比薄得多的单层表现出更高的弯曲刚度。
英文摘要：
The mechanical response of embedded ABA trilayer graphene flakes loaded in tension and compression on polymer beams is monitored by simultaneous Raman measurements through the strain sensitivity of the G or 2D peaks. A characteristic peculiarity of the investigated flake is that it contains a trilayer and bilayer part. The Bernal stacked bilayer was used as a strain sensor aiming to assess the efficiency of the load transfer from the polymer matrix through shear to the individual graphene layers. For the trilayer graphene in tension, both peaks are redshifted and splitting of the G peak is reported for the first time. In compression, the studied sample was an almost isolated trilayer, in which both peaks are blue-shifted up to a critical compressive strain. This critical strain is found to be one fourth of the value found in the case of single layer graphene despite the higher bending rigidity that trilayer exhibits over the much thinner monolayer.
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