Abstract
A facile modified dip coating method has been developed to fabricate ultra-smooth, transparent and superhydrophilic TiO2 thin films on glass substrates. Post-annealing at temperatures over 400°C in dry air resulted in anatase TiO2 structures. The TiO2 film by coating once possessed an ultra-smooth surface with a root mean square (RMS) roughness of 2.6±0.7nm, which was attributed to the auxiliary effect of N2 flow during the formation of the film. The film on glass substrate showed a high visible transparency with a transmittance higher than 87%, which was comparable to that for a clean glass slide. Completely wetting was realized on the TiO2 film within 60ms from water droplet deposition without UV irradiation, indicating that a superhydrophilic surface was achieved. Tests on hydrophilic stability showed the TiO2 film remained superhydrophilic with an equilibrium water contact angle less than 5° within 15days. The TiO2 film on glass substrate also displayed excellent antifogging performance.
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