Abstract
The effect of an Ar plasma treatment on polycarbonate substrates was investigated using <TEX>$TiO_2$</TEX> coatings produced by reactive ion-beam assisted sputtering. The typical pressure used during sputtering was about <TEX>$10^{-4}$</TEX> Torr. After the Ar plasma treatment, the contact angle of a water droplet was reduced from <TEX>$88^{\circ}$</TEX> to <TEX>$52^{\circ}$</TEX> and then further decreased to <TEX>$12^{\circ}$</TEX> with the addition of oxygen into the chamber. The surface of the polycarbonate substrate hanged from hydrophobic to hydrophilic with these treatments and revealed its changing nano-scale roughness. The <TEX>$TiO_2$</TEX> films on the treated surface showed various colors and periodic ordering dependant on the film thickness due to optical interference.
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