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In the present investigation (WO3)n films were synthesized by Sol-Gel methodology by dip coating techniques using Na2WO4 as precursor salt to form polytungstic acid ((WO3)n. nH2O), which by dehydration formed the oxide (WO3)n that was deposited in two different substrates: 316L stainless steel and FTO (Fluorine doped Tin Oxide), which were deposited under the same experimental conditions and subsequently sintered at 400 ° C for a lapse of 30 minutes in both cases. It was observed that the film of (WO3)n deposited on steel presented a greater photocurrent generated of 133 μAcm-2, compared to 29 μAcm-2 for (WO3)n film measured by cyclic voltammetry in a potentiostat (AUTOLAB PGSTAT302N) against the FTO-supported film. The films were characterized using Fourier Transform Infrared Spectroscopy (FTIR) techniques, using the SHIMADZU IR PRESTIGE 21 FTIR spectrophotometer to recognize W-O-W (826 cm-1) links on the surface of the FTO and W-O-W links (652 cm-1), W=O (953 cm-1), W-O (1414 cm-1) and O-H vibration (2338 cm-1) on the steel surface; Raman spectroscopy at 532 nm to confirm symmetric stretches of W-O bonds that could not be clearly identified by FTIR; X-ray diffraction (XRD) to confirm the crystalline structure of the films, finding a predominantly monoclinic structure whose base structure corresponds to WO3, and an approximate estimate of crystallite size of 27,4 nm determined by the equation of Debye Scherrer and X-ray Dispersive Energy (EDX) for elemental analysis, yielding a centesimal composition of 77,7 % by mass of W corresponding to the empirical formula of WO3, and finally a morphological analysis by Scanning Electron Microscopy (SEM) that showed which showed the formation of layers (films) with nanostructures with non-uniform particle size ranging between 50 and 100 nm

SÍNTESIS Y CARACTERIZACIÓN DE PELÍCULAS DE (WO3 )n VÍA SOL-GEL MEDIANTE TÉCNICA DE RECUBRIMIENTO POR INMERSIÓN