FisMat2017 - Submission - View

Abstract's title: Controlling size and self-assembly of graphene nanoribbons by templating and functionalization
Submitting author: Mirco Panighel
Affiliation: ICN2
Affiliation Address: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
Country: Spain
Oral presentation/Poster (Author's request): Poster
Other authors and affiliations: Cesar Moreno (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain), Sabela Quiroga (Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), C/J. de la Fuente, Campus Vida, U. de Santiago de Compostela, 15782 Santiago de Compostela, Spain), Manuel Vilas (Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), C/J. de la Fuente, Campus Vida, U. de Santiago de Compostela, 15782 Santiago de Compostela, Spain), Enrique Guitian (Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), C/J. de la Fuente, Campus Vida, U. de Santiago de Compostela, 15782 Santiago de Compostela, Spain), Dolores Perez (Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), C/J. de la Fuente, Campus Vida, U. de Santiago de Compostela, 15782 Santiago de Compostela, Spain), Diego Pena (Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), C/J. de la Fuente, Campus Vida, U. de Santiago de Compostela, 15782 Santiago de Compostela, Spain), Aran Garcia-Lekue (onostia International Physics Center, Paseo M. de Lardizabal 4, 20018 San Sebastian, Spain), Gustavo Ceballos (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain), Aitor Mugarza (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain)
Abstract

Bottom-up processes involving the coupling of molecular precursors enable synthesizing atomically precise, functionalized graphene nanoribbons (GNRs) [1], with tailored electronic and chemical properties [2]. Despite the variety of studies in the direction of tuning the intrinsic GNR properties, less effort has been devoted on the control of their size and ensemble patterning. Here we show that the combination of chemical functionalization and surface templating can be exploited to obtain different types of self-assembled structures with different GNR length. By growing chevron-type GNRs with different functional groups on Au(111), we tune the balance between the interaction with the surface and the neighbouring GNRs. This leads to either a template-guided periodic assembly of individual GNRs, where the herringbone reconstruction imposes their size and position, or a close-packed 2D domains of long GNRs, when stronger intermolecular interactions drive the assembly (see Fig. 1). The chemical and structural integrity at each step of the on-surface synthesis, namely debromination and cyclodehydrogenation, are tracked by combined X-ray photoelectron spectroscopy (XPS) and scanning tunnelling spectroscopy (STM) measurements. Local scale characterization of the electronic structure, carried out by combining tunnelling spectroscopy and ab-initio calculations, helps to correlate the different interactions with internal charge distributions.

References

[1] Grill, L. et al. Nature Nanotechnol. 2, 687 (2007); Cai, J. et al., Nature 466, 470 (2010).

[2] Chen, Y. et al. ACS Nano 7, 6123 (2013); Son, Y. et al. Nature 444, 347 (2006); Yang, L. et al. Phys. Rev. Lett. 99, 186801 (2007); Ruffieux, P. et al. ACS Nano 6, 6930 (2012).