Effect of mixed and non-mixed solvent on the coating properties of sol gel TiO2 thin films

Wan Zulkifli, Wan Amirul Shafiz (2015) Effect of mixed and non-mixed solvent on the coating properties of sol gel TiO2 thin films. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Nowadays ceramics or glass is commonly used for many applications either in industrial, semiconductor or in daily life. On the other hand, we need to maintain the level of cleanliness of the glass. Furthermore, bacteria also can simply grow on the glass surface. Thus, to prevent the bacteria growth, TiO2 coating is being used for glass substrate and Titanium Tetra isopropoxide as the precursor. From the previous research, they are using several techniques for coating the glass such as spray technique, spin coating and also sol-gel. In the sol-gel method, solvent is an important part to create sol-gel. The right choice of solvent is a critical important because mostly the sol-gel is need the solvent. From the solvent, we can determine the difference of their effect to the crystal size, phases, and also on the effect of morphological. From the reaction with the TiO2, we can distinguish the quality of the coating to the substrates and their effect to the solution properties. However, we also need to care about the accuracy of the solvent added because when the solvent are not accurate, we cannot differentiate their effect to the precursor accurately. By using the solvent, we know that we can get various types of microstructure and morphological effect, for example by adding the methanol; we can get the presence of anatase and rutile phases and have the small crystallite size. However, it was rarely used is by mixing the solvent where by mixing the difference solvent can give the difference effect. There is an interesting innovation to study the effect of the solvent to the coating properties. By study a lot of solvent used as a solvent will get the interesting result as an effect to the coating and substrates. TiO2 coating solution with appear of high amount of propanol with mixing solvent with ethanol shows good surface morphology which is the crack were reduced compared to the less amount of propanol.

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