Fabrication Of SnO₂-Base Coating Glass And Their Surface Modification

The Online low-E glasses have the advantages of low cost, high bonding strength, and it was known as one of the optimal methods to conserve energy. In this paper, we prepared SnO₂ films with low emission by spray pyrolysis, and then fabricated TiO₂-SiO₂ thin films with self-cleaning capability on the prepared SnO₂ films above. The UV-Vis spectrometer, SEM, TEM and microscope were adopted to analyze the photoelectric properties, crystal structure and surface quality of the films, and to analyze the formation process of SnO₂ films fabricated by spray pyrolysis and the cause of the defect. We also study the low emission properties and self-cleaning capability of TiO₂-SiO₂ thin films at last, the results obtained were shown as follows:（1） The base tempreture and the liquid flux are the dominating factor for repeating and stabilizing the technics, the tempered gas flux can enhance deposition efficiency and decrease the defects of the surface. The films show excellent quality when adopted double air exhaust and the flow of the liquid, substrate temperature were controlled at 1.30ml/s and 530℃ respectively.（2） The formation mechanism analyse of the film indicate that optimal films can be obtained when the fogdrops were dried at 70-150℃ into gel-drops before they were deposited on the substrate, but the notch and hole will be formed when the fogdrops were deposited on the substrate in form of liquid and powder.（3） The air degradation efficiency of TiO₂-SiO₂/SnO₂ film relative to oleic acid can up to 50% after 3 hour’s illumination, which was increased by 4% compared to TiO₂-SiO₂ film, in a word, the SnO₂ substrate enhance the potochemical catalysis efficiency of TiO₂;（4） Self-cleaning properties of low-E glass can be obtained after modified with the TiO₂-SiO₂ film which was prepared at 480℃ and the thinckness of TiO₂-SiO₂ film is 60nm. The contact angel of the modified Low-E glass decreases to 4.5° after UV irradiation for 1h, which indicates good antifogging capability. However, the low emission of the glass shows little change.