ABSTRACT

This chapter discusses the chemical modification of graphene molecules in due course of its 'spin chemistry in action. Molecular adsorption of hydrogen on the graphene is weak and preferable to the two-side accessible free-standing membrane. It is accompanied with a small coupling energy and low saturation covering. Stepwise hydrogenation is followed by the gradual substitution of the sp2-configured carbon atoms of the pristine NGr molecule by the sp3 atoms of H-graphene. The hydrogen atom behavior can be characterized by the average length of CH bonds that they form. Empirical graphene hydrogenation reveals itself as complex and variable. Experimental studies of graphene hydrogenation are not numerous, perhaps because these are inevitably of the same type. The regular distribution of hydrogen clusters over hexagonal moire pattern preserves the Dirac cone spectrum while shifting it down, thus opening the band gap.