Anisotropic growth of buckling-driven wrinkles in graphene monolayer
Anisotropic growth of buckling-driven wrinkles in graphene monolayer
复制标题
石墨烯单层中屈曲驱动的皱纹的各向异性生长
DOI：
10.1088/0957-4484/26/6/065701
复制
发表时间：
2015-02-13
期刊：
影响因子：
3.5
通讯作者：
Wu, HengAn
中科院分区：
文献类型：
--
作者：
Liu, XiaoYi;Wang, FengChao;Wu, HengAn
我们从理论上和数值上研究了石墨烯单层中褶皱的生长。结果发现，在石墨烯单层的屈曲驱动的皱纹的增长是显着的手性和尺寸依赖。在小尺寸下，石墨烯片的弯曲响应不能用经典的欧拉状态精确描述，并且非连续效应导致沿石墨烯片的优选屈曲。随着尺寸的增大，压缩区的宽长比α对屈曲驱动褶皱的生长起着重要的作用。当α < 0.5时，发生沿扶手椅方向的斜压屈曲;当0.5 < α < 1.0时，边缘翘曲的影响导致沿扶手椅方向的屈曲。当1.0 < α < 3.0时，由于手征弯曲刚度引起的势能密度差导致沿扶手椅方向的优先屈曲。当α > 3.0时，非连续效应和手征弯曲刚度都可以忽略，单层石墨烯的屈曲是各向同性的。石墨烯单分子层中压缩屈曲的手性沿优先转变导致对石墨烯基纳米器件，特别是具有高频响应的纳米器件的动力学机制的基本理解。
We theoretically and numerically investigate the growth of buckling-driven wrinkles in graphene monolayers. It is found that the growth of buckling-driven wrinkles in a graphene monolayer is remarkably chirality- and size-dependent. In small sizes, the flexural response of a graphene sheet cannot be accurately described by the classical Euler regime, and the non-continuum effect leads to zigzag-along-preferred buckling. With the increase of size, the width/length ratio α of the compressed region plays an important role in the growth of buckling-driven wrinkles. When α < 0.5, the oblique buckling happens in armchair-along compression; when 0.5 < α < 1.0, the effect of edge warp leads to zigzag-along-preferred buckling. When 1.0 < α < 3.0, the potential energy density difference due to chiral bending stiffness leads to armchair-along-preferred buckling. When α > 3.0, the non-continuum effect and chiral bending stiffness can both be neglected, and the buckling in a graphene monolayer is isotropic. The chirality-along-preferred transition of compressed buckling in a graphene monolayer leads to an improved fundamental understanding of the dynamics mechanism of graphene-based nanodevices, especially for the nanodevices with high frequency response.