Preparation and Characterization of W03‎ Electrochromic Films Obtained by the Sol-Gel Process‎

Tungsten trioxide (w03) films have been coated on indium thin oxide (ito) conductive glass substrate, using aqueous solution ofperoxotungstic acid (pta) by the sol-gel dip coating method x-ray diffractometery (xrd) analysis confirmed monoclinic and triclinic structure for the film and powdered w03 respectively. fourier transforms infrared spectroscopy (ft-ir) exhibitedthestructure ofperoxotungsticacid. the semmicrographofannealedspeciesrevealed microcracksdue todecrease ofdensityandcontractionoflayers. energy-dispersivex-ray (edx) study determined 1:3 ratios ofoxygen and tungsten atoms in the prepared films at heat treatment temperature higher than 200°c. the electrochromical behavior was investigated in 1m hcl solutionemployingcyclic voltammetry. itwas foundthat w03filmsdemonstrated goodreversibility at 200°c.