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.

Details

Title
Hydrogen on graphene investigated by inelastic neutron scattering
Author
Cavallari, C 1 ; Pontiroli, D 2 ; Jiménez-Ruiz, M 3 ; Ivanov, A 3 ; Mazzani, M 2 ; Gaboardi, M 2 ; Aramini, M 2 ; Brunelli, M 3 ; Riccò, M 2 ; Rols, S 4 

 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 
 Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Parma Parco Area delle Scienze 7/A, 43124 Parma, Italia 
 Institut Laue Langevin, 6 rue J. Horowitz, 38042 Grenoble, France 
 Institut Laue Langevin, 6 rue J. Horowitz, 38042 Grenoble, France; To whom any correspondence should be addressed 
Publication year
2014
Publication date
Nov 2014
Publisher
IOP Publishing
ISSN
17426588
e-ISSN
17426596
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2576763418
Copyright
© 2014. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.