Graphene is the strongest known material thanks to its stiff carbon-carbon bonds. But its strength can be compromised by “wrinkles.” New experiments on stretched graphene sheets find that their stiffness (the resistance to stretching) depends on how much the sheets have already been stretched. The explanation is that graphene starts out crumpled and only exhibits its super strength when it is flattened out by a sufficient amount of stretching. These observations imply that a reassessment may be needed for the planned use of graphene in nanoelectromechanical devices.
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