Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: Organic-Inorganic Systems III: Metal-Organics
O 58.7: Talk
Wednesday, March 9, 2016, 16:45–17:00, S054
Electric transport properties of pristine and loaded surface-anchored metal-organic frameworks — Jianxi Liu1, Tobias Wächter2, Andreas Irmler3, Peter G. Weidler1, Hartmut Gliemann1, Fabian Pauly3, Veronica Mugnaini1, •Michael Zharnikov2, and Christof Wöll1 — 1Institute of Functional Interfaces, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany — 2Applied Physical Chemistry, University of Heidelberg, 69120 Heidelberg, Germany — 3Department of Physics, University of Konstanz, 78457 Konstanz, Germany
Understanding of the electric transport through surface-anchored metal-organic frameworks (SURMOFs) is important both from a fundamental perspective as well as with regards to possible future applications in electronic devices. To address this mostly unexplored subject, we integrated a series of representative SURMOF thin films, formed by copper nodes and trimesic acid and known as HKUST-1, in a mercury-drop based tunneling junction. Although the transport properties of these SURMOFs are analogous to those of hybrid metal-organic molecular wires, manifested by a very low value of the tunneling decay constant (β = 0.006 1/Å), they are at the same time found to be consistent with a linear increase of resistance with film thickness. Upon loading of SURMOF pores with ferrocene or tetracyanoquinodimethane (TCNQ), a noticeable increase in transport current was observed, being especially dramatic (6 orders of the magnitude) in the case of TCNQ. Relevant structural and transport models are discussed.