Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 17: Metal substrates: Adsorption of organic / bio molecules III
O 17.7: Talk
Monday, March 14, 2011, 18:45–19:00, TRE Phy
Interface properties of a biphenyl-based metal-molecule-metal junction — •Marc Saitner1, Felix Eberle2, Dieter M. Kolb2, Johnny Baccus1, Patrick Wagner1,3, Marc D'Olieslaeger1,3, and Hans-Gerd Boyen1 — 1Institute for Materials Research (IMO), Hasselt University, B-3590 Diepenbeek, Belgium — 2Institute for Electrochemistry, Ulm University, D-89069 Ulm — 3IMEC, Division IMOMEC, B-3590 Diepenbeek, Belgium
Here we report on the successful preparation of a metal/molecule/metal junction, in which a biphenyl (BP) self-assembled monolayer (SAM) on Au(111) is metalized by Pd using a recently developed electrochemical approach.[1] The junction is studied by cyclic voltametry (CV), in-situ scanning tunneling microscopy (STM) and ex-situ X-ray as well as ultraviolet photoelectron spectroscopy (XPS, UPS). A quantitative chemical analysis of the BP SAM points towards the formation of a densely packed molecular layer attached to the base electrode (Au single crystal) via Au-S bounds. The successful metallization of such SAMs with a Pd monolayer is demonstrated by means of angle-resolved XPS. Both metal-molecule interfaces in the junction can be studied in more detail using angle-resolved UPS thereby allowing to identify local-density of states effects [2,3] in the electronic structure of the involved metals.
[1] T. Baunach et al., Adv. Mater. 16, 2024 (2004)
[2] H.-G. Boyen et al., Nat. Mater. 5, 394 (2006)
[3] M. Manolova et al., Adv. Mater. 21, 320 (2009)