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Mechanical exfoliation is a widely used method to isolate high qualitygraphene layers from bulk graphite. In our recent experiments, some orderedmicrostructures, consisting of a periodic alternation of kinks and stripes,were observed in thin graphite flakes that were mechanically peeled from highlyoriented pyrolytic graphite (HOPG). A theoretical model is presented in thispaper to understand the formation of such ordered microstructures, based onelastic buckling of a graphite flake being subjected to a bending moment. Thewidth of the stripes predicted from this model agrees reasonably well with ourexperimental measurements.

Mechanical buckling induced periodic kinking/stripe microstructures in mechanically peeled graphite flakes from HOPG