Tungsten Trioxide Film Transmittance (3)

Using XRD-600 diffractometer analysis films structure and morphology which producing by different methods. Different forms of tungsten trioxide film were annealed at different temperatures.

After studies found films light transmittance is similar which produced by sol-gel method and magnetron sputtering method before annealing. the transmittance of thin film samples decreased after annealing at above 300 ℃, the light transmittance will reduce. Besides, annealing temperature more high the light transmittance will lower. Tungsten trioxide film are amorphous  which annealed at 350℃ below, within the range of 350 ~ 400 ℃ annealing, the amorphous film gradually complete transition to crystalline, annealing at 400 ℃ above, the substrate also had a diffraction peak. Morphology and optical properties of tungsten trioxide films have a great impact on its gas sensing properties, such as relatively porous amorphous film, which will help the adsorbed gas so the sensitivity of hydrogen may be higher than the crystalline structure of the film, so that the results of the study have some guidance on hydrogen Sensitivities.

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