Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 17: Metal substrates: Adsorption of organic / bio molecules III

O 17.8: Talk

Monday, March 14, 2011, 19:00–19:15, TRE Phy

STM investigation of the morphology of biphenylthiol self-assembled monolayers on Au(111) — •Heiko Muzik, Dan G. Matei, Laxman Kankate, Armin Gölzhäuser und Andrey Turchanin — Physik supramolekularer Systeme und Oberflächen, Universität Bielefeld

Self-assembled monolayers (SAMs) with an aromatic moiety directly attached to the sulfur head group are known to build highly corrugated surface morphologies on Au(111). A commonly observed pattern is the formation of islands with a gold step-edge height. The nature of this phenomenon has been rarely investigated, although it stands in contrast to the observation of so-called 'etch pits' in alkanethiol SAMs. In this contribution we present a scanning tunneling microscopy study of SAMs of 4'-nitro-1,1'-biphenyl-4-thiols and 1,1'-biphenyl-4-thiols on Au(111). We relate the different SAM morphologies to the molecular coverage, which was complementary determined by X-ray photoelectron spectroscopy. Based on these data we discuss why the classical picture of the molecule/substrate interface with the Au(111) binding sites has to be reviewed.