INVESTIGATION ON THE FORMATION OF RUO2-BASED MIXED OXIDE COATINGS BY SPECTROSCOPIC METHODS

摘要

Surface species formed as a function of the temperature during the preparation of RuO2/TiO2 mixed oxide films were identified by emission FT-IR and FT-Raman spectroscopy. The formation of surface carbonyls from precursor mixtures of hydrated RuCl3 and titanium diisopropoxide bis-2,4-pentanedionate was confirmed. The intensity of the CO stretching band increases with decreasing ruthenium content due to the increasing dispersity of the noble metal. The negative emission bands of the coating 20Ru + 80Ti proves the occurrence of a segregation phenomenon resulting in a TiO2-enriched surface layer. The results obtained are in agreement with those of former me asurements by simultaneous thermogravimetry-differential thermal analysis (TGA-DTA), thermogravimetry combined with mass spectrometry (TGA-MS) and secondary ion mass spectrometry (SIMS). References: 13