Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 13: Organic Molecules on Inorganic Substrates: Adsorption and Growth
O 13.7: Talk
Monday, March 17, 2025, 16:30–16:45, H8
Controlled Ion Beam Deposition supplied by Electrospray (ES-CIBD) - enabling UHV deposition of large, reactive or fragile building blocks for functional nano-architectures — •Andreas Walz1,2, Annette Huettig1,2, Michael Walz1,2, Hartmut Schlichting1,2, and Johannes V. Barth2 — 1pureions GmbH, Gilching, Germany — 2Technical University of Munich, Germany
Cutting-edge research in the field surface- and nano- science using organic molecules requires control and unbiased understanding of structure and composition. Standard deposition techniques for the underlying building blocks restrict possible candidates: Thermal evaporation in vacuum (MBE, OMBE) is limited to volatile substances. Solution-based techniques such as drop casting, spin coating or inkjet printing are versatile but often lack purity and quality. Electrospray ionization (ESI) combined with mass selection and soft-landing of molecules unravels the vast potential of large, reactive or bio-relevant building blocks. The pool of possible molecules spans a wide spectrum from small organic molecules, over graphene nanoribbons (GNRs) up to several kilo- and megadalton proteins, DNA, but also inorganic clusters and larger nanoparticles may be possible. In-line with this, we present an UHV ion beam deposition device and its functionalities. Deposited layers are analyzed via STM. The main body of the device contains RF-driven ion guides with high transmission (>80% efficiency). A digital square-wave quadrupole mass filter (dQMF) provides virtually unlimited m/z-range. The footprint is benchtop in size, 0,5 x 1 m.
Keywords: Electrospray; Ion beam deposition; mass spectrometry; soft-landing; digital quadrupol