A derivation of the sol-gel-dip-coating deposition technique is proposed, where the precursor solution exhibits two separated liquid phases, reaching an equilibrium state in a heterogeneous solution. Structural, optical and photocatalytic properties of TiO 2 films grown from the proposed two phases method are shown and discussed, along with the properties of films deposited when the top phase present distinct lengths, which are observed through SEM images and optical transmittance spectra. The dominant crystalline phase is anatase for all the films prepared. Films are tested towards their efficiency for photocatalysis, using methylene blue as dye degradation agent. It has been found that films deposited through the two phase method are more efficient on the photocatalyitic degradation of methylene blue.
Tin dioxide (SnO2) thin films are obtained from resistive evaporation of metallic Sn followed by thermal oxidation at different temperatures in the range 200–500[Formula: see text]C. Results show that, besides the thickness of the evaporated Sn thin film, the oxidation process of Sn into SnO2 is highly dependent on the annealing time and temperature, presenting tin monoxide (SnO), as an intermediate compound, result of partial oxidation of the metallic Sn at intermediary time and temperature. The optical and electrical properties of the Sn thin films are altered by the oxidation degree of Sn into SnO[Formula: see text]. These important characteristics are evaluated through UV-Vis, SEM, EDS, XRD and Impedance Spectroscopy. Increase in the optical bandgap energy as well as in the surface charge density, verified by electrical impedance, are observed on samples with higher annealing temperature and time, which indicate sequential oxidation process in these films.
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