title: Marked adsorption irreversibility of graphitic nanoribbons for CO2 and H2O.
abstract: Graphene and graphitic nanoribbons possess different types of carbon hybridizations exhibiting different chemical activity. In particular, the basal plane of the honeycomb lattice of nanoribbons consisting of sp(2)-hybridized carbon atoms is chemically inert. Interestingly, their bare edges could be more reactive as a result of the presence of extra unpaired electrons, and for multilayer graphene nanoribbons, the presence of terraces and ripples could introduce additional chemical activity. In this study, a remarkable irreversibility in adsorption of CO(2) and H(2)O on graphitic nanoribbons was observed at ambient temperature, which is distinctly different from the behavior of nanoporous carbon and carbon blacks. We also noted that N(2) molecules strongly interact with the basal planes at 77 K in comparison with edges. The irreversible adsorptions of both CO(2) and H(2)O are due to the large number of sp(3)-hybridized carbon atoms located at the edges. The observed irreversible adsorptivity of the edge surfaces of graphitic nanoribbons for CO(2) and H(2)O indicates a high potential in the fabrication of novel types of catalysts and highly selective gas sensors.
authors.affiliation: Department of Chemistry, Graduate School of Science, Chiba University, Inage-ku, Chiba, Japan.
authors.forename: Michihiro
authors.initials: M
authors.lastname: Asai
authors.forename: Tomonori
authors.initials: T
authors.lastname: Ohba
authors.forename: Takashi
authors.initials: T
authors.lastname: Iwanaga
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kanoh
authors.forename: Morinobu
authors.initials: M
authors.lastname: Endo
authors.forename: Jessica
authors.initials: J
authors.lastname: Campos-Delgado
authors.forename: Mauricio
authors.initials: M
authors.lastname: Terrones
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Nakai
authors.forename: Katsumi
authors.initials: K
authors.lastname: Kaneko
mesh_terms: D000327:Adsorption; D002245:Carbon Dioxide / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D014867:Water; D002245:Carbon Dioxide; D006108:Graphite