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DS: Fachverband Dünne Schichten

DS 43: Poster II: Organic thin films; Atomic layer deposition, Thin film characterization: Structure analysis and composition (XRD, TEM, XPS, SIMS, RBS, ...)

DS 43.16: Poster

Donnerstag, 3. April 2014, 16:00–19:00, P1

Investigation of the thermal stability and structure of 4,4'-dimercaptostilbene on Au(111) — •Johannes Völkner, Andre Pick, and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, 35032 Marburg

Sensing devices for biological molecular species such as proteins or sugars in solution are receiving increasing interest because they enable monitoring of physiological parameters or can lead to bioelectronics. One approach is a photoelectrochemical biosensor which requires an efficient coupling of involved semiconductor nano-particles and the gold electrode to enable charge transfer from the NP towards the electrode without direct quenching the optical excitation with the NP. In a previous study it was shown that self-assembled monolayers of 4,4'-dimercaptostilbene provide a suitable linker that combines structural order and sufficient conductance [1]. However, the ordering and quality of this thiolate-bound interlayer critically depends on several preparation parameters, such as assembling temperature and the choice of solvent. Therefore we investigated the thermal stability and structural order of differently prepared 4,4'-dimercaptostilbene self-assembled monolayers on Au(111) surfaces by means of TDS, XPS and NEXAFS.

[1] W. Khalid et al. ACS Nano, 5, 9870 (2011).