Filmes Finos de V2O5 dopados com Nb2O5.

Abstract

This work pretend to study thin films of vanadium pentoxide (V2O5) doped with niobium pentoxide (V2O5:Nb2O5) prepared by the sol-gel process. The sols were obtained by using niobium ethoxide (Nb(OCH2CH3)5) and vanadium alkoxide (OV(OCH(CH3)2)3 – vanadium oxytriisopropoxide) as precursors, isopropanol as solvent and glacial acetic acid as catalyst. The thin films were deposited by dip coating technique on a substrate (FTO). There will be a systematic study to obtain thin films with the desired electrochemical properties. The thin films deposited was submitted to a heat treatment of 350°C for 30 minutes in air atmosphere. In order thin films of V2O5 and V2O5:Nb2O5 were studied by different electrochemical techniques such as cyclic voltammetry (CV), chronoamperometry (CA), chronocoulometry (CC), electrochemical impedance spectroscopy (EIS) and UV-Vis spectroscopy. To study the morphology of the films were realized measurements of scanning electron microscopy (SEM) and atomic force microscopy (AFM). The objective of this work is to prepare and characterize thin films with electrochromic properties and the possibility of using these films as counter electrode in electrochromic device.