中文摘要：

机械脱落是一个广泛地使用的方法从体积石墨孤立高质量的 graphene 层。在我们的最近的实验，一些订了微观结构，由性变态和条纹的周期的引申组成，在薄石墨薄片被观察机械地从高度面向的 pyrolytic 被剥石墨。在这份报纸，一个理论模型被介绍在脱落期间把如此的订的结构的形成归因于二个机械过程的引申：(1 ) 一个石墨薄片脱皮并且(2 ) 薄片的机械弄弯正在受到弯曲。在这个模型，条纹 L 的宽度被薄片，表面精力 \(\gamma \) ，和批评弄弯紧张 \ 的厚度 h 决定(\varepsilon _{\mathrm { cr }}\) 。用 \(\gamma \) 和 \ 的一些适当价值(\varepsilon _{\mathrm { cr }}\) 那在另外的独立实验和模拟决定的范围以内，在条纹宽度之间的预言的关系和薄片厚度与我们的试验性的大小相当同意很好。相反地，在薄石墨薄片测量周期的微观结构的 Lh 关系能帮助决定批评机械弄弯紧张 \(\varepsilon _{\mathrm { cr }}\) 并且接口精力 \(\gamma \) 。

英文摘要：

Mechanical exfoliation is a widely used method to isolate high quality graphene layers from bulk graphite. In our recent experiments, some ordered microstructures, consisting of a periodic alternation of kinks and stripes, were observed in thin graphite flakes that were mechanically peeled from highly oriented pyrolytic graphite. In this paper, a theoretical model is presented to attribute the formation of such ordered structures to the alternation of two mechanical processes during the exfoliation： （1） peeling of a graphite flake and （2） mechanical buckling of the flake being sub- jected to bending. In this model, the width of the stripes L is determined by thickness h of the flakes, surface energy Y, and critical buckling strain ecr. Using some appropriate values of y and ecr that are within the ranges determined by other inde- pendent experiments and simulations, the predicted relations between the stripe width and the flake thickness agree reason- ably well with our experimental measurements. Conversely, measuring the L-h relations of the periodic microstructures in thin graphite flakes could help determine the critical mechan- ical buckling strain εcr and the interface energy γ.