What is "graphane"

n. An extended two-dimensional hydrocarbon, of general formula (CH)_n, derived from graphene by adding a hydrogen atom to each carbon atom alternately on each side of the plane.

Graphane is a two-dimensional polymer of carbon and hydrogen with the formula unit (CH) where n is large. Graphane should not be confused with graphene, a two-dimensional form of carbon alone. Graphane is a form of hydrogenated graphene. Graphane's carbon bonds are in sp configuration, as opposed to graphene's sp bond configuration, thus graphane is a two-dimensional analog of cubic diamond.