FisMat2017 - Submission - View

Abstract's title: Polycyclic Aromatic Hydrocarbons on Cu(111): a clue on surface assembly and electronic properties
Submitting author: Giovanni Di Santo
Affiliation: Elettra Sincrotrone Trieste
Affiliation Address: Strada Statale 14 - km 163,5 in AREA Science Park 34149 Basovizza, Trieste ITALY
Country: Italy
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations: Tanja Miletic (School of Chemistry, Cardiff University, Park Place, CF10 3AT, Cardiff - UK), Matteo Dalmiglio (ELETTRA - Sincrotrone Trieste S.C.p.A. Strada Statale 14 - km 163,5 in AREA Science Park 34149 Basovizza, Trieste ITALY), Tommaso Fontanot (Dipartimento di Fisica - Università di Trieste, via A.Valerio 2, 34127 Trieste ITALY), Andrea Goldoni (ELETTRA - Sincrotrone Trieste S.C.p.A. Strada Statale 14 - km 163,5 in AREA Science Park 34149 Basovizza, Trieste ITALY), Davide Bonifazi (School of Chemistry, Cardiff University, Park Place, CF10 3AT, Cardiff - UK), Luca Petaccia (ELETTRA - Sincrotrone Trieste S.C.p.A. Strada Statale 14 - km 163,5 in AREA Science Park 34149 Basovizza, Trieste ITALY)
Abstract

The assembly of molecular building blocks on crystalline surfaces into ordered nano-architectures is more and more an established approach towards the creation of novel materials with outstanding properties. The surface science methodology allows to investigate the morphology of novel molecular structures in the monolayer or sub-monolayer regime (e.g. self-assembled long range ordered 2D networks), and their electronic properties (e.g. density of states, charge transfer, HOMO-LUMO coupling)[1]. Eventually it may lead to a clear understanding of the molecule–to–substrate adsorption geometry together with the interaction between the first layer and the hosting surface. The use of techniques such as Scanning Tunneling Microscopy (STM), Low Energy Electron Diffraction (LEED) and Angle Resolved Photoemission Spectroscopy (ARPES) allows to enlighten on most of the unknown of those systems sorting out their electronic structure and the geometric arrangement. Nanosized polycyclic aromatic hydrocarbons (PAHs) are a class of compounds with exceptional electronic, self-assembling and synthetic properties.[1-3]

We show a few examples of PAHs adsorbed on the atomically flat Cu(111) surface. In our case studies we demonstrate that molecular derived electronic states can be disclosed with the ARPES based momentum mapping methodology [4] as long as the compounds, from which these states originate, can be assembled in long range ordered 2D networks on a well defined substrate, as it is revealed by STM and LEED. 

 

[1] U. Lewandowska et al. Angew. Chem. Int. Ed. 2014, 53, 12537 – 12541

[2] J. E. Anthony, Angew. Chem. Int. Ed. 2008, 47, 452–483; Angew. Chem. 2008, 120, 460–492.

[3] L. Chen et al. Angew. Chem. Int. Ed. 2012, 51, 7640–7654

[4] U. Weiß et al. (2015). Nature Communications, 6, 8287.