Layer upon layer: Method holds promise for making two- or three-tier graphene films

Graphene, a form of pure carbon arranged in a lattice just one atom thick, has interested countless researchers with its unique strength and its electrical and thermal conductivity. But one key property it lacks -- which would make it suitable for a plethora of new uses -- is the ability to form a band gap, needed for devices such as transistors, computer chips and solar cells.

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