Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 58: Organic-Inorganic Systems III: Metal-Organics

O 58.5: Invited Talk

Wednesday, March 9, 2016, 16:00–16:30, S054

Thin Films of Metal-Organic Frameworks: Functional, photoswitchable coatings and unique model systems — •Lars Heinke — Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Deutschland

Metal-organic frameworks (MOFs) are nanoporous, crystalline materials, assembled from metal notes and organic linker molecules. In addition to many potential applications of the (conventional) powder MOF material, well-defined thin films seem perfectly suited for challenging uses and as unique model systems, where certain molecular and MOF properties can be precisely measured by applying surface sensitive techniques. These thin films are prepared in a layer-by-layer fashion on a solid substrate by using liquid-phase epitaxy, referred to as the SURMOF-approach.

Incorporating photochromic molecules like azobenzene in the crystalline structure enables the switching of physical and chemical MOF properties by light. This can be used for various uses, such as realizing the remote-controlled release of guest molecules from a nanoporous container.

These thin films also enable detailed investigations of the molecules which are incorporated in the crystalline structure, unlike investigating these molecules in solution. In this way, the isomerization of isolated azobenzene moieties could be investigated.

Recently, the electronic structure and electrical properties of MOFs have become a research focus. SURMOFs have been used to investigate the direction-dependent conductivity in anisotropic MOF structures.