Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.24: Poster

Montag, 26. März 2012, 17:00–19:00, Poster B

Tuning of the silver ion release from polymer-metal nanocomposites containing gold-silver alloy or gold-core/silver-shell nanoparticles — •Nisreen Alissawi, Irmak Kocabas, Vladimir Zaporojtchenko, Thomas Strunskus, and Franz Faupel — Institute for Materials Science - Multicomponent Materials, Faculty of Engineering, Christian-Albrechts-University of Kiel, Kaiser Str. 2, 24143, Kiel, Germany

The tuning of silver ion release could be important for antimicrobial applications of silver where a controlled release is desired to prevent e.g. damage of human cells. Two dimensional Au-Ag alloy or Au-core/Ag-shell nanoparticle ensembles with various compositions on PTFE were prepared by physical vapor deposition (PVD) techniques and silver ion release kinetics in water were studied by determination of the dissolved silver using atomic absorption spectroscopy (AAS). Changes in the morphology, optical properties and composition of the nanocomposites were examined by using transmission electron microscopy (TEM), UV-visible spectroscopy (UV-Vis) and X-ray photoelectron spectroscopy (XPS), respectively. Results indicate that with increasing the gold fraction in the Au-Ag alloy nanoparticles a strong improvement of the oxidation resistance of the AgNPs occurs. This can be a good way to control the release of silver ions in solutions. Moreover, the effect of a polymer barrier of certain thickness was investigated for both model systems and the silver ion release rate was slowed down.