Regensburg 2013 – wissenschaftliches Programm

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PV: Plenarvorträge

PV XII

PV XII: Plenarvortrag

Mittwoch, 13. März 2013, 14:00–14:45, H15

Novel Strategies for the Assembly of Metacrystals: Epitaxial Growth of Three-dimensional Nanoporous Frameworks — •Christof Wöll — Inst. of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany

Engineering artificial materials with properties that may not be found in nature is a topic of pronounced scientific interest. A particularly appealing approach is to assemble metacrystals from nanoparticles (NPs). Metacrystals consisting of NPs positioned at the sites of a regular, strictly periodic array are predicted to exhibit exciting electronic, magnetic and optical properties. We will describe a novel strategy for the assembly of such 3d NP superlattices employing concepts from supramolecular chemistry. Metal-organic frameworks, MOFs, are highly regular, crystalline, 3-dimensional shelf systems with nm-sized pores. By employing liquid-phase epitaxy, such supramolecular frameworks can be grown from solution on modified solid substrates, yielding crystalline, oriented and homogenous layers referred to as SURMOFs[1]. Loading the SURMOF pores with metal NPs opens the possibility to create strictly periodic, metal or semiconductor NP 3d superlattices. We will discuss the physical and some of the chemical properties of these nanoporous (pore sizes of up to 10 nm have been reported) novel materials, describe the fabrication of surface-anchored MOFs on solid substrates using liquid-phase epitaxy (LPE) and discuss some of the strategies to load SURMOFs with nanoparticles.

[1] Epitaxially grown metal-organic frameworks Hartmut Gliemann, Christof Wöll, Materials Today 15, 110 (2012)