23 KB126 KB21 KB199219991998Jenko, MonikaMandrino, ĐorđeOrel, BorisSurca, Angelja Kjaraletnik:32številka:6str. 487-492ISSN:1318-0010COBISSID:91562URN:URN:NBN:SI:doc-H7FYFASIenInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijeinfrardeča spektroskopijakovinski oksidirentgenska analizasol-gel postopkitanki filmititanvanadijIR and X-ray photoelectron spectroscopy of V2O5, TiO2 and V/Ti-oxide sol-gel derived films| Infrardeča in rentgenska fotoelektronska spektroskopija V2O5, TiO2 in V/Ti-oksidnih sol-gel filmov|V/Ti-oxide films were prepared by deep-coating from sols made by mixing of V-oxisopropoxide and Ti-propoxide in V:Ti molar ratio in precursors 3:1, 1;1 and 1:3. Amorphous films were obtained after annealing at 300°C (1 h)). IR spectroscopic analysis revealed that V=Ostretching modes appeared at 1020 ?$cm^{-1}$? in the IR spectrum of powder (V:Ti = 1:1). however in the IR spectra of a film with the same molar ratio the bands at 1008 and 914 ?$cm^{-1}$? appeared suggesting the presence of ?$V^{4+}$?-O bonds. The new band at 790 ?$cm^{-1}$? signalled the V-O-Ti bridging bonds connection V-O and Ti-O polyhedra. XPS measurements confirmed that initial-state films contained ?$V^{5+}$?, ?$V^{4+}$? and ?$Ti^{4+}$? species, but at the film sufrace only ?$V^{5+}$? species existed. Sequential depth analysis of films performed with ?$Ar^+$? sputtering showed that the vanadium is reduced to 3+ oxidation state with progressive exposure while titanium is not affectedV/Ti-oksidne filme smo pripravili iz koloidnih raztopin. V-oksoizopropoksida in Ti-propoksida v 2-propanola s tehniko potapljanja. Molska razmerja V:Ti v prekurzorjih so znašala 3:1, 1:1 in 1:3. Amorfni filmi so nastali po segrevanju na 300°C (1h). V IR spektru praškastega vzorca (V:Ti = 1:1)so se valenčna nihanja V=O pojavila pri 1020 ?$cm^{-1}$?. V IR spektru filma z istim molskim razmerjem pa se pojavita trakova pri 1008 and 914 ?$cm^{-1}$?, kar kaže na prisotnost ?$V^{4+}$?-O vezi v filmih. Novi trak pri 790 ?$cm^{-1}$? kaže na V-O-Ti vezi, ki povezujejo poliedre V-O in Ti-O. XPS meritve so potrdile, da filmi vsebujejo ?$V^{5+}$?, ?$V^{4+}$? in ?$Ti^{4+}$?, medtem ko je na njihovem površju prisoten le ?$V^{5+}$?. Profilna analiza filma s pomočjo ?$Ar^+$? ionskega jedkanja je pokazala, da se vanadij tekom jedkanja reducira do oksidacijskega stanja 3+, medtem ko jedkanje ne vpliva na oksidacijsko stanje titanaNadaljuje se kot: Materiali in tehnologijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije