EFFECT OF ANNEALED AMBIENT ON STRUCTURAL, MORPHOLIGAL AND ELECTROCHROMIC PROPERTIES OF WO3 NANOPLATES
Keywords:
Electrochromic, WO3, nanoplate, acid treatmentAbstract
In this study, we report the metal oxide nanostructure for electrochromic application based on tungsten oxide (WO3) material. The WO3 nanostructure was prepared by three steps: (1) tungsten metalic films were deposited onto ITO coated glass substrate via dc magnetron sputtering. (2) The WO3 nanostructures were grown on tungsten film by acid treatment process. After acid treatment process, the tungsten oxide hydrate (WO3•H2O) with nanostructure was developed. Final step, the tungsten oxide hydrate were annealed at 400C for 2 h. The effect of annealed ambient on morphology, structural, optical and electrochromic properties was investigated using X-ray diffraction, field emission scanning electron microscopic, transmission electron microscope (TEM) and UV-Vis-NIR spectrophotometer. It was demonstrated that the annealing ambient played an important role in influential the crystal phase, morphology and optical property and of the tungsten oxide hydrate film. The chromogenic mechanism from the thermochromism phenomenon could be found at sample annealed in vacuum ambient. The prepared sample annealed in air ambient depict the electrochromic behavior in H2SO4 electrolyte solution.
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