A surprising result on the structure of bilayer silicene was reported by a Brazilian group. Silicene is buckled, whereas graphene is flat. Indeed, a Chemistry Nobel Laureate, Prof. Roald Hoffmann of Cornell, even recently suggested that flat free-standing silicene is impossible [Angew. Chem. 52, 93 (2013)]. What the Brazilian group showed, computationally, is that a bilayer silicene could have flat layers, due to the repulsion of the “protruding” atoms.

April 9, 2013