Dresden 2006 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 24: Poster presentation
DS 24.10: Poster
Dienstag, 28. März 2006, 15:00–17:30, P2
Oxide - noble metals - nanocomposites for gas sensing applications — •Sajid U. Khan1, Giray Kartopu1, Andre Piorra1, Klaus Rätzke2, Claus-Henning Solterbeck1, and Mohammed Es-Souni1 — 1Institute for Materials and Surface Technology, Kiel University of Applied Sciences, Kiel, Germany — 2Technical Faculty, Chair of Multicomponent Materials, Christian-Albrechts-University, Kiel, Germany
We report on the processing of TiO2 and SnO2-noble metal thin film nanocomposites using a one step sol-gel method. The films were spin coated on oxidized silicon substrates and subsequently annealed at temperatures as low as 400∘C. The noble metals essentially Pt and Au were added to the oxide precursor solutions either in form of colloidal solutions or as an acid compound. Microstructural characterization included Raman spectroscopy, XRD, X-ray porosimetry and electrical force microscopy (EFM). The gas sensing properties in reducing gases such as hydrogen and carbon monoxide were investigated using a custom set-up at different temperatures. It is shown that mesoporous nanocrystalline thin films of both oxides with embedded nanoparticles of Pt or gold can be obtained. The EFM investigations show homogeneously distributed noble metal nanoparticles. Preliminary results on gas sensing properties indicate high sensitivities at temperatures as low as 250∘C.