Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 6: Organic Molecules on Inorganic Substrates I: Adsorption & Growth
O 6.2: Talk
Monday, March 18, 2024, 10:45–11:00, MA 042
Unlocking non-volatile molecular building blocks for atomically clean vacuum depositions — •Andreas Walz1,2, Annette Huettig1,2, Michael Walz1,2, Hartmut Schlichting1,2, and Johannes V. Barth1 — 1Technical University of Munich, Physics E20, Garching, Germany — 2pureions GmbH, Gilching, Germany
Novel nanostructures of organic and anorganic compounds require precise growth of clean films on well-defined surfaces. Their fabrication is technically limited: Thermal evaporation in vacuum (MBE, OMBE) is constrained to volatile species. Wet/ solution-based techniques (drop casting, spin coating, inkjet printing) are broadly applicable, but often lack purity and quality.
Controlled Ion Beam Deposition (CIBD), realized in a NanoPrinter device from pureions, combines the best of both: a broad range of fragile species under ultra-clean conditions enabled by Electrospray Ionization (ESI) e.g., functionalized small molecules (e.g. linkers for MOFs), graphene nanoribbons, up to large biomolecules like proteins or DNA. Other ion sources such as MALDI, laser vaporization or magnetron sputtering cluster sources are also considered. Transfer of the ions to ultra-high vacuum (UHV) and mass filtering via a digital quadrupole mass filter (dQMF) removes all unwanted neutral or ionic impurities. Soft-landing or if wished, reactive-landing for on-surface chemistry, is both ensured by control of energy and dose. CIBD is a new tool providing functional nanostructures for all kinds of applications, e.g. in organic electronics / photovoltaics / LEDs / sensors / transistors, nanocatalysis, energy storage, molecular packaging, biotech, pharma.
Keywords: Ion beam deposition; Preparative mass spectrometry; mass selection; on-surface synthesis; coating