Synthesis and Characterization of Titania and Vanadia Thin Films at Organic Self-Assembled Monolayers
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SYNTHESIS AND CHARACTERIZATION OF TITANIA AND VANADIA THIN FILMS AT ORGANIC SELF-ASSEMBLED MONOLAYERS T.P. NIESEN*, J. WOLFF*, J. BILL*, M.R. DE GUIRE**, F. ALDINGER* *Max-Planck-Institut ffir Metallforschung and Institut Mr Nichtmetallische Anorganische Materialien, Universitit Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstr. 5, Stuttgart, GERMANY, [email protected] "**Department of Materials Science & Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106-7204, USA ABSTRACT Functionalized self-assembled monolayers (SAMs) on single-crystal Si wafers have been used as substrates for the deposition of titania and vanadia thin films. The formation of a titanium chelate was used to stabilize an otherwise spontaneously precipitating aqueous titanium solution. Uniform titania films have been synthesized from Ti(O 2)2÷in aqueous HC1 solutions at 80'C on sulfonated SAMs. Vanadium oxide hydrate films, V20 5"0.7 H20, have been directly formed from aqueous vanadate solutions on NH 2-terminated SAMs at 45°C. In the as-deposited films, water molecules were intercalated between the vanadium oxide layers. Subsequent annealing at 350'C in air led to nanocrystalline V 20 5 . INTRODUCTION Organic self-assembled monolayers (SAMs) have been shown to be effective surfaces for promoting the formation of oxide thin films from aqueous solutions at low temperatures (
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