Regensburg 2019 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 12: Diamond II (joint session KFM/HL)
KFM 12.1: Vortrag
Mittwoch, 3. April 2019, 09:30–09:50, PHY 5.0.20
Antibacterial propensities of UNCD with embedded silver nanodroplets — •Daniel Merker1, Blagovesta Popova2, Tobias Weingärtner3, Thomas Bergfeldt3, Gerhard Braus2, Johann Peter Reithmaier1, and Cyril Popov1 — 1Institute of Nanostructure Technologies and Analytics, Universität Kassel, Kassel, Germany — 2Institute for Microbiology and Genetics, Universität Göttingen, Göttingen, Germany — 3Institute of Applied Materials - Applied Materials Physics, Karlsruher Institut für Technologie, Eggenstein-Leopoldshafen, Germany
Thin diamond films are considered a promising material for coating of implants due to the mechanical and chemical durability in combination with biological compatibility. These properties are utilized to increase the lifetime and support the tissue integration of the implant. In this work we address another issue for implantation surgery, namely the danger of a bacterial infection. We prepared ultrananocrystalline diamond (UNCD) films with embedded silver nanodroplets to utilize the well-known antibacterial effect of silver ions. The changes in the morphology of the Ag nanodroplets depending on the conditions for their preparation was investigated by SEM and AFM and afterwards the composition of the resulting UNCD/Ag/UNCD layers was revealed by AES. The thickness of the capping UNCD layer can provide a control mechanism for the silver release. Therefore, we prepared samples with different capping layer thicknesses and investigated the amount of the released Ag into water with ICP-MS. Finally, we tested the layers against two bacteria: E. coli and B. subtilis.