According to a theoretical study, opening a band gap in graphene can be practically opened by using CH-Pi interactions. The researchers from the Department of Chemistry at the University of Puerto Rico say that due to the equivalence breaking of two sublattices of graphene, a 90 meV band gap is opened in graphene/C4H bilayer. The band gap can be further increased to 270 meV by sandwiching graphene between two C4H layers.

This is the first time the CH/Pi interaction (a weak hydrogen-bond occurring between soft acids and soft bases) in graphene has been studied.