COLORIMETRIC ANALYSIS OF PHOTOCROMIC FILMS OF TiO2 AND TiO2 DOPED WITH TUNGSTEN USING THE CIE-L*a*b* SYSTEM

Reference Presenter Authors
(Institution)
Abstract
06-056 Luana Góes Soares Soares, L.G.(Universidade Federal do Rio Grande do Sul); BERGMANN, C.P.(UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL); Alves, A.K.(Universidade Federal do Rio Grande do Sul); Photochromism is a phenomenon of color change, which occurs in certain materials when they receive some type of electromagnetic radiation, which can be: ultraviolet radiation, visible or infrared. The thin films of metal oxides are among the materials described in the literature, with the possibility of having their optical properties modified. The relevance of the use of these materials ranges from obtaining excellent optical properties to applications in various branches of industry, such as: intelligent windows, solar energy converters, camouflage, information storage devices, toys, cosmetics, textile industry, jewelry, among others. Within this context, this work intends to study the photochromic effect in films by means of colorimetric tests. To determine the phases present by X-ray diffraction (XRD) and the microstructure of the samples by scanning electron microscopy (SEM). Preliminary results indicate that the films presented good photochromic properties as a result of the synchronicity between TiO2 and W properties, which express variations between the different colors, followed by a shorter response time.
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