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Superelasticity and wrinkles controlled by twisting circular graphene

机译：扭曲石墨烯可控制超弹性和皱纹

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摘要

Controllable wrinkles in terms of amplitude, wavenumber and onset torsional angle are realized by using a twisting way of circular graphene sheets. A parametric study is carried out to investigate several factors, i.e., graphene size (inner radius r(I) and outer radius R-o) and torsional angle, on the wrinkle formation of graphene. The effects of both wavenumber and amplitude are investigated in detail, because they are the most critical parameters in tuning the surface morphology that is finally reflected on the electrical properties of graphene. It is found that the onset torsional angle on the formation of wrinkles decreases as the graphene size increases. When the torsional angle increases continuously, the amplitude will abruptly jump due to a sudden change in the wrinkle pattern. The wrinkle wavenumber of graphene can also be controlled by changing the ratio of the inner and outer radii (i.e., r(I)/R-o). The variation of the strain energy shows that the structural transformation is reversible, this is mainly caused by the superelastic property of graphene. Hence, the formation of recyclable wrinkles can be realized by loading and unloading processes. (C) 2018 Elsevier B.V. All rights reserved.
机译：通过圆形石墨烯片的扭曲方式，可实现在幅度，波数和起始扭转角方面的可控皱纹。进行参数研究以研究石墨烯的皱纹形成的几个因素，即石墨烯的尺寸（内半径r（I）和外半径R-o）和扭转角。详细研究了波数和振幅的影响，因为它们是调节表面形态的最关键参数，最终反映在石墨烯的电性能上。发现随着石墨烯尺寸的增加，在皱纹形成上的起始扭转角减小。当扭转角连续增加时，由于皱纹图案的突然变化，振幅将突然跳跃。石墨烯的皱纹波数也可以通过改变内半径和外半径的比率（即，r（I）/ R 0）来控制。应变能的变化表明结构转变是可逆的，这主要是由石墨烯的超弹性引起的。因此，可通过装卸过程实现可回收皱纹的形成。 （C）2018 Elsevier B.V.保留所有权利。

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