Abstract
Nanocomposites of titanium dioxide(TiO2) and multi-walled carbon nanotubes (MWNTs) were prepared and depositedby sol–gel spin coating on borosilicate substrates and sintered in air at300 °C for 15 min. Further irradiation of the films with differentCO2 laser intensities(4.3–17 W m−2) was carried outin order to crystallize TiO2 in the anatase form while preserving the MWNT’s structure. The laser irradiation changedthe crystal structure of the coatings and also affected the wettability and photocatalyticactivity of the films. The anatase phase was only observed when a minimum laser intensity of12.5 W m−2 was used. The contact angle decreased with the enhancement of the laserintensity. The photocatalytic activity of the films was determined from thedegradation of a stearic acid layer deposited on the films. It was observed that theaddition of carbon nanotubes themselves increases the photocatalytic activity ofTiO2 films. This efficiency is even improved when highCO2 laser intensities are used during the sintering of the coatings.
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