Graphene buckles under stress

Graphene, a one-atom-thick planar sheet of sp2-bonded carbon atoms that are densely packed in a honeycomb crystal lattice, has shown remarkable physical properties such as room temperature quantum Hall effect and high electron mobility. These discoveries were initially made on flakes of graphene sheets that are readily obtainable through mechanical exfoliation of a graphite crystal. Alternatively, wafer-sized graphene can be grown epitaxially on SiC, by the sublimation of silicon atoms from the SiC substrate at high temperatures (~1400 °C). However, ridges and wrinkles are often observed on these epitaxial graphene films. Full Story

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