title: Experimentally engineering the edge termination of graphene nanoribbons.
abstract: The edges of graphene nanoribbons (GNRs) have attracted much interest due to their potentially strong influence on GNR electronic and magnetic properties. Here we report the ability to engineer the microscopic edge termination of high-quality GNRs via hydrogen plasma etching. Using a combination of high-resolution scanning tunneling microscopy and first-principles calculations, we have determined the exact atomic structure of plasma-etched GNR edges and established the chemical nature of terminating functional groups for zigzag, armchair, and chiral edge orientations. We find that the edges of hydrogen-plasma-etched GNRs are generally flat, free of structural reconstructions, and terminated by hydrogen atoms with no rehybridization of the outermost carbon edge atoms. Both zigzag and chiral edges show the presence of edge states.
authors.affiliation: Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Zhang
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Yazyev
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Feng
authors.forename: Liming
authors.initials: L
authors.lastname: Xie
authors.forename: Chenggang
authors.initials: C
authors.lastname: Tao
authors.forename: Yen-Chia
authors.initials: YC
authors.lastname: Chen
authors.forename: Liying
authors.initials: L
authors.lastname: Jiao
authors.forename: Zahra
authors.initials: Z
authors.lastname: Pedramrazi
authors.forename: Alex
authors.initials: A
authors.lastname: Zettl
authors.forename: Steven G
authors.initials: SG
authors.lastname: Louie
authors.forename: Hongjie
authors.initials: H
authors.lastname: Dai
authors.forename: Michael F
authors.initials: MF
authors.lastname: Crommie
mesh_terms: D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D006108:Graphite