Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Focussed session: Functional molecules at surfaces I

O 30.5: Vortrag

Dienstag, 27. März 2012, 12:00–12:15, A 053

Redox mediation by immobilised centres in the pores of a SURMOF metal-organic framework — •André Dragässer¹, Osama Shekhah², Olexandra Zybaylo², Cai Shen³, Manfred Buck³, Christof Wöll², and Derck Schlettwein¹ — ¹Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen — ²Karlsruhe Institute of Technology, Institute of Functional Interfaces, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen — ³University of St Andrews, EaStCHEM School of Chemistry, St Andrews, KY169ST, UK

Functionalizing surfaces by a highly ordered porous layer and loading of its pores with functional molecules appears very attractive. Very flexible frameworks are available in the form of metal-organic frameworks (MOFs). These frameworks are highly oriented thermally stable porous powders with a pore size of about 1 - 10 nm useful for gas separation, chromatography, and also for electrical and electronic applications. MOFs can be prepared on highly ordered surfaces to yield so-called SURMOFs. Their charge transport characteristics and redox properties are of pronounced interest. In this work, a layer of a metal-organic framework (SURMOF) was prepared by liquid-phase epitaxy on a self-assembled thiol monolayer on polycrystalline Au. Cyclic voltammetry in contact with a redox-active electrolyte was performed to probe charge transport through such SURMOF phases. Charge transport across these insulating membranes could be established by ferrocene as an immobilised redox mediator. Reversibility of the immobilisation and its role in the electrode kinetics is discussed.