Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 9: Solid-Liquid Interfaces: Structure, Spectroscopy I

O 9.9: Vortrag

Montag, 20. März 2017, 12:30–12:45, WIL C307

Calcium-Silicate Phases Explained by High Temperature Resistant Phosphate-Probe Molecules — •Nicolas Giraudo and Peter Thissen — Karlsruher Institut für Technologie (KIT), Institut für Funktionelle Grenzflächen (IFG), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

In this work, high temperature resistant phosphate molecules are applied to characterize ultrathin (100 nm) Calcium-Silicate (C-S) phases. These C-S phases are synthetized on silicon wafers, and the interaction of phosphates with the C-S phases is studied by means of in-situ transmission Fourier Transform Infrared (FTIR) spectroscopy. At room temperature the chemistry of the system is dominated by the formation of Calcium-Phosphates (C-P). In case of temperatures rising up to 1000 °C, the C-S phases are regenerated. FTIR results are analyzed on the basis of first-principles calculations and further supported by complementary Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) experiments. This study provides a detailed and self-consistent picture of the chemical and structural properties of interfaces like the one between the atmosphere and ultrathin C-S phases (gas/C-S) and the one between them and silicon wafers (C-S/Si bulk). The material combination of ultrathin C-S phases grown on silicon wafers might in the future have great potential in selective chemistry, catalysis and sensing technology as well as in the semiconductors manufactory.