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Abstract
Inelastic neutron scattering experiments and ab-initio calculations have been used to investigate the vibrational modes, in a wide energy region between 0 and 200 meV, of hydrogenated graphene produced by chemical method. The results show the presence of atomic hydrogen chemisorbed at the graphene surface. At 10 K, the measured high energy density of states is remarkably similar to that of hydrogenated ball-milled graphite, in which hydrogen is most likely bonded to C atoms at the edges. In fact, in both hydrogenated graphene and hydrogenated ball-milled graphite, the high frequency modes (100-200 meV) show strong similarities with the C-H bending modes of the coronene molecule, in which hydrogen is bonded at the edges. This hypothesis has been supported by ab-initio calculations.
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Details
1 Institut Laue Langevin, 6 rue J. Horowitz, 38042 Grenoble, France; Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Parma Parco Area delle Scienze 7/A, 43124 Parma, Italia
2 Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Parma Parco Area delle Scienze 7/A, 43124 Parma, Italia
3 Institut Laue Langevin, 6 rue J. Horowitz, 38042 Grenoble, France
4 Institut Laue Langevin, 6 rue J. Horowitz, 38042 Grenoble, France; To whom any correspondence should be addressed