Regensburg 2019 – scientific programme
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DS: Fachverband Dünne Schichten
DS 14: Poster
DS 14.22: Poster
Tuesday, April 2, 2019, 17:00–20:00, Poster E
Hydrophobic and hydrophilic silica shells on metal nanoparticles via plasma-enhanced in-flight coating process — Lisa Wurlitzer1,2, Patrick Post3, •Simon Homann1,2, Wolfgang Maus-Friedrichs1,2, and Alfred Weber3 — 1Institute of Energy Research and Physical Technology, Leibnizstraße 4, 38678 Clausthal-Zellerfeld, Germany — 2Clausthal Centre of Material Science, Agricolastraße 2, 38678 Clausthal-Zellerfeld, Germany — 3Institute of Particle Technology, Leibnizstraße 19, 38678 Clausthal-Zellerfeld, Germany
Coated nanoparticles have a wide variety of applications in modern material science because of their interesting properties. TiO2-nanoparticles for example are used in sunscreen, because of their photocatalytic activity. The goal of this work is to produce silica shells with metal and TiO2 as core-materials for a targeted creation of hydrophilic and hydrophobic layers. SiO2 is the here desired shell material because of its chemical inertness and optical transparency. This is archived with a modified method of an in-flight plasma-enhanced-chemical-vapor-deposition (PECVD) using a non-thermal dielectric barrier discharge. Tetryethyl orthosilicate (TEOS) and hexamethyldisiloxane (HMDSO) were used as precursors. The coated particles are studied via x-ray photoelectron spectroscopy (XPS). Results show a hydrophilic coating of silica-organic material on platinum using HMDSO, while the deposition of TEOS on TiO2 results in a hydrophobic, inorganic silica shell.