Graphene hydrogenation progress. (a) A graphene layer, where delocalized electrons are free to move between carbon atoms, is exposed to a beam of hydrogen atoms. (b) In nonconductive graphane, hydrogen atoms bond to their electrons with electrons of carbon atoms and pull the atoms out of the plane .
Zhou et al. Nanoscale Research Letters 2014 9:26 doi:10.1186/1556-276X-9-26