Vidros recobertos com camadas delgadas transparentes de SnO2

• Main Author: Rizzato, Alessandro P. [UNESP]
• Publication Date: 1998
• Other Authors: Pulcinelli, Sandra Helena [UNESP], Santilli, Celso Valentim [UNESP]
• Format: Article
• Language: por
• Source: Repositório Institucional da UNESP
• Download full: http://dx.doi.org/10.1590/S0100-40421998000400025; http://hdl.handle.net/11449/27560
• topic: SnO2 thin layers; corrosion resistant; coated borosilicate glass

SnO2 thin layers, prepared from aqueous colloidal suspensions by the sol-gel process, have been dip-coated on commercial borosilicate glasses. The effect of the conditions of deposition on the optical and structural characteristics of the thin layers was analysed by UV-Vis spectroscopy, x-ray reflectometry and electron scanning microscopy. Layers prepared with withdrawal speed in between 0.1 and 10cm/min show thickness smaller than 90nm, roughness of the order of 2nm and transmittance higher than 80%, resulting in good optical quality samples. The roughness increases from 2 to 11nm as the withdrawal speed increases from 10 to 80cm/min, what seems to be associated to the enlargement of the layers thickness (> 90nm). The measurements of mass loss, done after etching with fluoridric acid show that the coated samples are more corrosion resistant than the uncoated borosilicate glass.