Hydrophilic of SiO2/TiO2 double layers thin film prepared by sol-gel dip coating method

摘要

In this study, TiO2, SiO2 and SiO2/TiO2 double layers thin films were prepared and coated on the glass plate via sol-gel dip coating method. The samples were characterized using X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) to analyze the present of TiO2 and SiO2 compounds in the prepared samples. Meanwhile, UV-Vis spectrophotometer was used to measure the transmittance spectra of the thin films and the water contact angle was analyzed to determine the hydrophilic properties. XRD result revealed that the TiO2 xerogel was anatase phase after the calcination. As for SiO2 xerogel, the pattern of IR spectra demonstrated the formation of SiO2 network. Therefore, from these results, the TiO2 and SiO2 xerogels were successfully prepared. Besides that, surface morphology of prepared coating films were studied using Scanning Electron Microscopy (SEM). As expected for SiO2/TiO2 double layers thin film, SiO2 particles aggregates were randomly distributed on the surface of TiO2. Performance wise, the prepared coating samples were also shown a positive result of water contact angle analyses. This finding revealed that a SiO2/TiO2 double layers thin film has demonstrated hydrophilic property based on the 13.9° of contact angle achieved. Moreover, the light transmittance of this thin film at normally incident light can be reached up to 70%. Therefore, it can be summarized that SiO2/TiO2 double layers thin film demonstrated a hydrophilic surface in nature.