hrvatski

Modifikacija sastava elektrolita kao metoda kontrole morfologije titanatnih filmova

In order to enable new utilisation of already widely applied titania materials in photovoltaic and photocatalytic areas, TiO2 with various levels of nanostructured organisation have been prepared. Used cost-efficient synthesis method enhances the chemical stability and nontoxicity of amorphous titania thin-films. Nanostructured titania thin-films were prepared using electrochemical anodization cell with Ti working electrode and Pt counter electrode, under 60 V voltage for 3 h in fluoride-based electrolytes of different compositions. The composition varied from 2 wt.% to 24 wt.% of water, with constant 0.3 wt.% ammonium fluoride and remaining ethylene glycol. The electrolytes were electrochemically characterized using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), while Fourier transformed infrared spectroscopy (FTIR) was performed before and after anodization to observe chemical changes. The prepared titania thin-films were structurally characterized by Raman spectroscopy (RS) and microstructurally by scanning electron microscopy (SEM) with the aim to correlate to different water contents in the electrolytes. It was shown that water content is responsible for significant differences in horizontal and vertical morphologies of the obtained thin films. Water contents of about 11% enabled perfectly ordered nanotubes on large scale, suitable for photovoltaic applications while below and above that the thin titania films exhibit morphology suitable for photocatalytic applications.

titanatni flmovi ; anodizacija ; SEM ; CV ; EIS

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