title: Comparative structural and electronic studies of hydrogen interaction with isolated versus ordered silicon nanoribbons grown on Ag(110).
abstract: We have investigated the geometry and electronic structure of two different types of self-aligned silicon nanoribbons (SiNRs), forming either isolated SiNRs or a self-assembled 5 × 2/5 × 4 grating on an Ag(110) substrate, by scanning tunnelling microscopy and high resolution x-ray photoelectron spectroscopy. At room temperature we further adsorb on these SiNRs either atomic or molecular hydrogen. The hydrogen absorption process and hydrogenation mechanism are similar for isolated or 5 × 2/5 × 4 ordered SiNRs and are not site selective; the main difference arises from the fact that the isolated SiNRs are more easily attacked and destroyed faster. In fact, atomic hydrogen strongly interacts with any Si atoms, modifying their structural and electronic properties, while molecular hydrogen has first to dissociate. Hydrogen finally etches the Si nanoribbons and their complete removal from the Ag(110) surface could eventually be expected.
authors.affiliation: Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, Spain. mdavila@icmm.csic.es
authors.forename: M E
authors.initials: ME
authors.lastname: Dávila
authors.forename: A
authors.initials: A
authors.lastname: Marele
authors.forename: P
authors.initials: P
authors.lastname: De Padova
authors.forename: I
authors.initials: I
authors.lastname: Montero
authors.forename: F
authors.initials: F
authors.lastname: Hennies
authors.forename: A
authors.initials: A
authors.lastname: Pietzsch
authors.forename: M N
authors.initials: MN
authors.lastname: Shariati
authors.forename: J M
authors.initials: JM
authors.lastname: Gómez-Rodríguez
authors.forename: G
authors.initials: G
authors.lastname: Le Lay
mesh_terms: D000327:Adsorption; D003460:Crystallization / Q000379:methods*; D004579:Electron Transport; D006859:Hydrogen / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012825:Silicon / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D012834:Silver; D006859:Hydrogen; D012825:Silicon