RT info:eu-repo/semantics/article
T1 From graphene oxide to pristine graphene: revealing the inner workings of the full structural restoration
A1 Rozada, Rubén
A1 López Santodomingo, María José
A1 Villar Rodil, Silvia
A1 Cabria Álvaro, Iván
A1 Alonso Martín, Julio Alfonso
A1 Martínez Alonso, Amelia
A1 Tascón, Juan M. D.
K1 Grafeno
AB High temperature annealing is the only method known to date that allows the complete repair of a defective lattice of graphenes derived from graphite oxide, but most of the relevant aspects of such restoration processes are poorly understood. Here, we investigate both experimentally (scanning probe microscopy) and theoretically (molecular dynamics simulations) the thermal evolution of individual graphene oxide sheets, which is rationalized on the basis of the generation and the dynamics of atomic vacancies in the carbon lattice. For unreduced and mildly reduced graphene oxide sheets, the amount of generated vacancies was so large that they disintegrated at 1773–2073 K. By contrast, highly reduced sheets survived annealing and their structure could be completely restored at 2073 K. For the latter, a minor atomic-sized defect with six-fold symmetry was observed and ascribed to a stable cluster of nitrogen dopants. The thermal behavior of the sheets was significantly altered when they were supported on a vacancy-decorated graphite substrate, as well as for the overlapped/stacked sheets. In these cases, a net transfer of carbon atoms between neighboring sheets via atomic vacancies takes place, affording an additional healing process. Direct evidence of sheet coalescence with the step edge of the graphite substrate was also gathered from experiments and theory.
PB Royal Society of Chemistry
SN 2040-3364
YR 2015
FD 2015
LK http://uvadoc.uva.es/handle/10324/32450
UL http://uvadoc.uva.es/handle/10324/32450
LA eng
NO Nanoscale, 2015, 7, 2374
NO Producción Científica
DS UVaDOC
RD 26-abr-2024