Studies On Wrinkling Behaviour And Mechanical Property Of Wrinkled Graphene

The incomparable advantages of graphene in physics, chemistry and mechanicsmake itself as the first choice material of nano electronic devices, touch screens,transistors, the gene sequencing and the aerospace in the future. Moreover, as anecessary condition for the existence of graphene, wrinkles have relationships with theproperties of graphene. Therefore, the researches on the characteristics of wrinkles andthe effects caused by wrinkles are considerably valuable on the theoretical studies andapplications.Firstly, molecule dynamics simulation is used to obtain wrinkling parameters of arectangular SLGS under edge shearing in this paper. Then the abrupt jumps originatedfrom the movements of key atom in wrinkled region are captured to determine thecritical wrinkled and collapsed strains and further to elucidate the physics of graphenewrinkling. Meanwhile, the studies on the effects of temperature and aspect ratio onwrinkles are used to understand the temperature and size dependences of graphenewrinkling. In addition, a shearing wrinkling model is presented and wrinklingparameters are predicted by continuum theory. Similarities and differences are madecomparisons and analyses between the molecule dynamics and the continuum theory onthe research of graphene wrinkles.Secondly, based on the wrinkling analyses, the research on vibration characteristicsof wrinkled graphene is performed. An out-of-plane load is applied to induce wrinkledgraphene oscillate freely and the vibration frequency is obtained by the fast Fouriertransform which is used to transfer the information of energy versus time into therelationship of frequency versus response. Meanwhile, the effects of configurations andstrains in wrinkles on vibration characteristics are discussed in detail. In addition, thevibration frequency is predicted by the continuum theory to verify the results.Finally, we perform non-equilibrium molecular dynamics to investigate the effectof shear-wrinkling on thermal conductivity of graphene in this paper. One wrinklingwave is then captured to emphatically analyze its pattern and directional effects onthermal conductivity. Furthermore, the physical insight of wrinkling effects on thermalconductivity is discussed and some prospective ideas about the design of excelle ntnanoscale thermal management devices are proposed.The results and conclusions, including the wrinkling mechanism, the effects onvibration characteristics and thermal conductivity of wrinkled graphene, may providegood supports and developments to wrinkling mechanics of graphene. They may alsogive a reference to design graphene device based on wrinkling control and be of great significance to advance graphene devices into engineering applications.