Estudo dos Filmes finos de heterojunção de V2O5:WO3 pela técnica dip-coating

Abstract

This dissertation is based on the need to find solutions to a current problem in our society, the reduction of electricity consumption in order to have a positive impact on the environment and a possible reduction in costs. Taking into account the above, it was decided to study thin films with electrochromic properties, which are used in smart windows. These smart windows are able to change their color, for example, changing from an almost transparent color to a darker one. In this way, we will study the films V2O5: WO3. The method for preparing V2O5 is via the sol-gel process, and the deposition process was performed using the dip-coating technique. The thin films of V2O5, after being deposited, were submitted to a thermal treatment of 350° and those of WO3 to 250°. The V2O5, WO3 and V2O5:WO3 films were studied using different electrochemical techniques such as cyclic voltammetry, chronoamperometry and chronocoulometry, optical studies were performed using UV-vis transmittance. Morphological information was extracted using Atomic Force Microscopy. The aim of this work is to prepare and characterize thin films of V2O5:WO3 through the sol-gel route to evaluate their electrochromic properties.