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In this work core/shell composite polymer/TiO 2 nanofibers and from those TiO 2 nanotubes were prepared. First, poly(vinyl alcohol) (PVA) and poly(vinylpyrrolidone) (PVP) fibers were synthetized by electrospinning. They were covered with a 100 nm thick amorphous TiO 2 layer by atomic layer deposition at 50 °C. Later the polymer core was removed by two different methods: dissolution and annealing. In the case of dissolution in water, the as-prepared TiO 2 nanotubes remained amorphous, while when annealing was used to remove the polymers, the TiO 2 crystallized in anatase form. Due to this, the properties of amorphous and crystalline TiO 2 nanotubes with exactly the same structure and morphology could be compared. The samples were investigated by SEM-EDX, ATR-IR, UV-Vis, XRD and TG/DTA-MS. Finally, the photocatalytic properties of the TiO 2 nanotubes were studied by decomposing methyl-orange dye under UV light. According to the results, crystalline anatase TiO 2 nanotubes reached the photocatalytic performance of P25, while amorphous TiO 2 nanotubes had observable photocatalytic activity.

Photocatalytic Crystalline and Amorphous TiO2 Nanotubes Prepared by Electrospinning and Atomic Layer Deposition