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Abstract's title: From organometallic structures to graphene nanoribbons: Dibromopyrene on Ag(110)
Submitting author: Marco Smerieri
Affiliation: CNR - IMEM
Affiliation Address: Via Dodecaneso 33, 16146 Genova, Italia
Country: Italy
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations: Igor Píš (bc), Lara Ferrighi(d), Silvia Nappini (c),  Angelique Lusuan (ae),  Cristiana Di Valentin (d), Luca Vaghi (d), Antonio Papagni (d), Mattia Cattelan (f), Stefano Agnoli (f), Elena Magnano (cg), Federica Bondino (c), Letizia Savio (a)  --- (a) IMEM-CNR, UOS Genova, Via Dodecaneso 33, 16146 Genova, Italy (b) Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5, 34149 Basovizza (TS), Italy (c) IOM-CNR, Laboratorio TASC, S.S. 14 km 163.5, 34149 Basovizza (TS), Italy (d) Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy (e) Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy (f) Department of Chemical Science, University of Padova, Via F. Marzolo 1, 35131 Padova, Italy (g) Department of Physics, University of Johannesburg, PO Box 524, Auckland Park, Johannesburg, South Africa
Abstract

In this talk our recent results on the formation of low dimensional carbon nanostructures on Ag(110) will be presented [1,2]. By a combination of scanning tunneling microscopy, spectroscopic techniques and density functional theory calculations, we demonstrate the formation of extended, chiral patterns of parallel graphene nanoribbons (GNR) by surface assisted Ullmann coupling and de-hydrogenation [3] of 1,6-dibromo-pyrene. The so-formed polymers are monodispersed in width and show alternated zig-zag and armchair sites at the edges. It’s well known that graphene is a material of exceptional properties, but its intrinsic zero-energy gap reduces the impact for applications in nanoelectronics. On the contrary, GNRs narrower than 10 nm are semiconductors, due to the electron confinement in one dimension and to edge effects [4]. The ability to grow highly ordered nano-ribbons is therefore of relevance for possible applications in nanodevices. Besides that, our result demonstrates the peculiarity of pyrene derivatives for the formation of GNRs on coinage metals, in particular on Ag(110). These results open the possibility of engineering nanostructures of particular shape and dimension (and hence with tailored electronic properties) by choosing suitable molecular precursors. This is further demonstrated by results on Br-Corannulene self-assembly on the same substrate.

 

Keywords:Graphene nanoribbons; surface assisted polymerization; dibromo-pyrene Ullman coupling; STM; photoemission spectroscopy; DFT

 

References

[1] M. Smerieri, I. Píš, S. Nappini, A. Lusuan, L. Ferrighi, C. Di Valentin, L. Vaghi, A. Papagni, M.  Cattelan, S. Agnoli, E. Magnano, F. Bondino, L. Savio, Nanoscale 8 (2016).

[2] M. Smerieri, I. Píš, S. Nappini, A. Lusuan, L. Ferrighi, C. Di Valentin, L. Vaghi, A. Papagni, E. Magnano, F. Bondino, L. Savio, in preparation.

[3] C. Zhang, Q. Sun, H. Chen, Q. Tan, W. Xu, ChemComm 51 (2015) 495

[4] X. Li, X. Wang, L. Zhang, S. Lee, H. Dai, Science 319 (2008) 1229