Nicholl Ryan J T, Lavrik Nickolay V, Vlassiouk Ivan, Srijanto Bernadeta R, Bolotin Kirill I
Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA.
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Phys Rev Lett. 2017 Jun 30;118(26):266101. doi: 10.1103/PhysRevLett.118.266101. Epub 2017 Jun 27.
We investigated the effect of out-of-plane crumpling on the mechanical response of graphene membranes. In our experiments, stress was applied to graphene membranes using pressurized gas while the strain state was monitored through two complementary techniques: interferometric profilometry and Raman spectroscopy. By comparing the data obtained through these two techniques, we determined the geometric hidden area which quantifies the crumpling strength. While the devices with hidden area ∼0% obeyed linear mechanics with biaxial stiffness 428±10 N/m, specimens with hidden area in the range 0.5%-1.0% were found to obey an anomalous nonlinear Hooke's law with an exponent ∼0.1.
我们研究了面外褶皱对石墨烯膜力学响应的影响。在我们的实验中，使用加压气体对石墨烯膜施加应力，同时通过两种互补技术监测应变状态：干涉轮廓测量法和拉曼光谱法。通过比较通过这两种技术获得的数据，我们确定了量化褶皱强度的几何隐藏面积。隐藏面积约为0%的器件遵循双轴刚度为428±10 N/m的线性力学，而隐藏面积在0.5%-1.0%范围内的样品被发现遵循指数约为0.1的反常非线性胡克定律。
