title: Synthesis of graphene nanoribbons with a defined mixed edge-site sequence by surface assisted polymerization of (1,6)-dibromopyrene on Ag(110).
abstract: By a combination of scanning tunneling microscopy, X-ray spectroscopic techniques and density functional theory calculations, we prove the formation of extended patterns of parallel, graphene nanoribbons with alternate zig-zag and armchair edges and selected width by surface-assisted Ullmann coupling polymerization and dehydrogenation of 1,6-dibromopyrene (C16H8Br2). Besides the relevance of these nanostructures for their possible application in nanodevices, we demonstrate the peculiarity of halogenated pyrene derivatives for the formation of nanoribbons, in particular on Ag(110). These results open the possibility of tuning the shape and dimension of nanoribbons (and hence the correlated electronic properties) by choosing suitably tailored or on-purpose designed molecular precursors.
authors.affiliation: IMEM-CNR, UOS Genova, Via Dodecaneso 33, 16146 Genova, Italy. letizia.savio@imem.cnr.it.
authors.forename: Marco
authors.initials: M
authors.lastname: Smerieri
authors.affiliation: Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5, 34149 Basovizza (TS), Italy. igor.pis@elettra.eu and IOM-CNR, Laboratorio TASC, S.S. 14 km 163.5, 34149 Basovizza (TS), Italy.
authors.forename: Igor
authors.initials: I
authors.lastname: Píš
authors.affiliation: Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy.
authors.forename: Lara
authors.initials: L
authors.lastname: Ferrighi
authors.affiliation: IOM-CNR, Laboratorio TASC, S.S. 14 km 163.5, 34149 Basovizza (TS), Italy.
authors.forename: Silvia
authors.initials: S
authors.lastname: Nappini
authors.affiliation: IMEM-CNR, UOS Genova, Via Dodecaneso 33, 16146 Genova, Italy. letizia.savio@imem.cnr.it and Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy.
authors.forename: Angelique
authors.initials: A
authors.lastname: Lusuan
authors.affiliation: Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy.
authors.forename: Cristiana
authors.initials: C
authors.lastname: Di Valentin
authors.affiliation: Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Vaghi
authors.affiliation: Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Papagni
authors.affiliation: Department of Chemical Science, University of Padova, Via F. Marzolo 1, 35131 Padova, Italy.
authors.forename: Mattia
authors.initials: M
authors.lastname: Cattelan
authors.affiliation: Department of Chemical Science, University of Padova, Via F. Marzolo 1, 35131 Padova, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Agnoli
authors.affiliation: IOM-CNR, Laboratorio TASC, S.S. 14 km 163.5, 34149 Basovizza (TS), Italy and Department of Physics, University of Johannesburg, PO Box 524, Auckland Park, 2006, Johannesburg, South Africa.
authors.forename: Elena
authors.initials: E
authors.lastname: Magnano
authors.affiliation: IOM-CNR, Laboratorio TASC, S.S. 14 km 163.5, 34149 Basovizza (TS), Italy.
authors.forename: Federica
authors.initials: F
authors.lastname: Bondino
authors.affiliation: IMEM-CNR, UOS Genova, Via Dodecaneso 33, 16146 Genova, Italy. letizia.savio@imem.cnr.it.
authors.forename: Letizia
authors.initials: L
authors.lastname: Savio