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Living on the edge: A nanographene molecule adsorbed across gold step edges


Treier, M; Ruffieux, P; Schillinger, R; Greber, T; Müllen, K; Fasel, R (2008). Living on the edge: A nanographene molecule adsorbed across gold step edges. Surface Science, 602(13):L84-L88.

Abstract

The unusual adsorption geometry of the large graphene-like polycyclic aromatic hydrocarbon hexa-peri-hexabenzocoronene (HBC) across kinks on the stepped vicinal Au(11 12 12) surface has been studied by synchrotron radiation X-ray photoelectron diffraction (XPD) and scanning tunneling microscopy (STM). By a combination of the two techniques a complete characterisation of the adsorption behaviour is achieved, yielding information on preferential adsorption sites (STM) and molecular orientation (XPD). At low coverage (<0.15 ML) HBC adsorbs across kink sites in fcc-stacking regions with its axis rotated by 19° with respect to the step edge normal direction and the polyaromatic disc tilted by 12° relative to the (1 1 1) terraces of the substrate. Furthermore, a small fraction of HBCs adsorbs across straight step edges. The possible exploitation of the characteristic step- and kink-adsorption of molecular derivates of HBC in supramolecular architectures is exemplified at the example of the adsorption of a HBC-derivative on the same substrate.

Abstract

The unusual adsorption geometry of the large graphene-like polycyclic aromatic hydrocarbon hexa-peri-hexabenzocoronene (HBC) across kinks on the stepped vicinal Au(11 12 12) surface has been studied by synchrotron radiation X-ray photoelectron diffraction (XPD) and scanning tunneling microscopy (STM). By a combination of the two techniques a complete characterisation of the adsorption behaviour is achieved, yielding information on preferential adsorption sites (STM) and molecular orientation (XPD). At low coverage (<0.15 ML) HBC adsorbs across kink sites in fcc-stacking regions with its axis rotated by 19° with respect to the step edge normal direction and the polyaromatic disc tilted by 12° relative to the (1 1 1) terraces of the substrate. Furthermore, a small fraction of HBCs adsorbs across straight step edges. The possible exploitation of the characteristic step- and kink-adsorption of molecular derivates of HBC in supramolecular architectures is exemplified at the example of the adsorption of a HBC-derivative on the same substrate.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2008
Deposited On:10 Feb 2009 15:45
Last Modified:06 Dec 2017 16:53
Publisher:Elsevier
ISSN:0039-6028
Publisher DOI:https://doi.org/10.1016/j.susc.2008.04.031

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