Bulk defective graphene produced by thermal exfoliation of graphite oxide was treated under H-2 and investigated with X-ray photoemission spectroscopy, neutron spectroscopy, and solid state nuclear magnetic resonance. Graphene defects appear effective in dissociating H2 molecule and in promoting H covalent absorption on the carbon backbone. Measured generalized phonon density of states shows the presence of localized peaks ascribed to C H bending modes already in pristine graphene, whose intensities enhance when samples are treated under H2 at 1273 K. However, H-1 NMR evidences a thermally activated dynamics with a correlation time of a few microseconds assigned to a part of H atoms bound onto the graphene plane. These findings point toward a diffusive dynamics of the hydrogen chemically e, bound to graphene sheets, already active at room temperature.

Daniele, P., Matteo, A., Mattia, G., Marcello, M., Sanna, S., Filippo, C., et al. (2014). Tracking the Hydrogen Motion in Defective Graphene. JOURNAL OF PHYSICAL CHEMISTRY. C, 118, 7110-7116 [10.1021/jp408339m].

Tracking the Hydrogen Motion in Defective Graphene

SANNA, SAMUELE;
2014

Abstract

Bulk defective graphene produced by thermal exfoliation of graphite oxide was treated under H-2 and investigated with X-ray photoemission spectroscopy, neutron spectroscopy, and solid state nuclear magnetic resonance. Graphene defects appear effective in dissociating H2 molecule and in promoting H covalent absorption on the carbon backbone. Measured generalized phonon density of states shows the presence of localized peaks ascribed to C H bending modes already in pristine graphene, whose intensities enhance when samples are treated under H2 at 1273 K. However, H-1 NMR evidences a thermally activated dynamics with a correlation time of a few microseconds assigned to a part of H atoms bound onto the graphene plane. These findings point toward a diffusive dynamics of the hydrogen chemically e, bound to graphene sheets, already active at room temperature.
2014
Daniele, P., Matteo, A., Mattia, G., Marcello, M., Sanna, S., Filippo, C., et al. (2014). Tracking the Hydrogen Motion in Defective Graphene. JOURNAL OF PHYSICAL CHEMISTRY. C, 118, 7110-7116 [10.1021/jp408339m].
Daniele, Pontiroli; Matteo, Aramini; Mattia, Gaboardi; Marcello, Mazzani; Sanna, Samuele; Filippo, Caracciolo; Pietro, Carretta; Chiara, Cavallari; St...espandi
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/549498
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 27
  • ???jsp.display-item.citation.isi??? 24
social impact