Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.48: Poster

Montag, 11. März 2013, 18:00–20:00, Poster E

Atom Probe Tomography of Polyelectrolytes and Metall Compounds — •Martin Lütkemeyer — Institut für Materialphysik, Münster, Germany

Laser Assisted Atom Probe Tomography (LA-TAP) with femtosecond lasers has the potential to give chemical and structural information of organic materials like polymers at an atomic scale. We are able to measure and identify poly(acrylic acid) and poly(allylamine hydrochloride) which are deposited on the apex of tungsten tips. The deposition is done by the Layer by Layer technique, in which the tungsten tips are consecutively dipped into poly-anion and poly-cation solutions so that a polyelectrolyte multilayer (PEM) system is build. This procedure enables us to investigate metallic nanoparticles in a new way with the LA-TAP by simply embedding them into the PEM's by dipping the polymer coated tungsten tips into a solution of colloidal nanoparticles. However, due to complex mass spectra and difficult evaporation behaviors of both PEM-matrix and nanoparticles the measurement and reconstruction of these tips is challenging. To demonstrate that it is indeed possible to get chemical and structural information of those materials at such a small scale with the LA-TAP, reconstructions of Au-nanoparticles embedded in PEM's, and corresponding composition profiles and mass spectra will be presented.