Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 96: Atomic Layer Deposition (DS jpointly with O)
O 96.2: Talk
Friday, April 4, 2014, 10:00–10:15, CHE 91
ALD on Multi-Stacked Polystyrene Opals for Thermal Barrier Coatings — •Robert Zierold1, Martin Waleczek1, Josep M. Montero Moreno1, Roman Kubrin2, Hooi Sing Lee3, Alexander Petrov3, Manfred Eich3, Gerold A. Schneider2, and Kornelius Nielsch1 — 1Institut für Angewandte Physik, Universität Hamburg — 2Institut für Keramische Hochleistungswerkstoffe, Technische Universität Hamburg-Harburg — 3Institut für Optische und Elektronische Materialien, Technische Universität Hamburg-Harburg
Thermal Barrier Coatings (TBC) are used to protect thermally highly loaded metallic components, such as turbine blades in gas engines, from excessive heat and thus prolong the life time of the component.
Herein, we present a novel synthesis route for multi- stacked, photonic crystals made of titania and zirconia revealing a multi-bandgap structure in the infrared, a prerequisite for a TBC. Sequential self-assembly of monodisperse polystyrene particles with different diameters between 315 and 756 nm results in multi-stacked direct opals. The polymer template is then conformally molded by low temperature ALD—with its capabilty to coat complex nanostructures without shadowing effects due to its self-limited nature—processes with TiO2 and ZrO2 from the precursors titanium isopropoxide (TTIP) or tetrakis(ethylmethylamino) zirconium (TEMAZ), respectively, and H2O. Subsequently, calcination of the polystyrene leads to high quality photonic crystals. Optical characterization of the tailor-made samples reveals reflectance peaks in the near infrared corresponding to the different stop-gaps of the individual layers with different periodicities.