Influence of Ethylene Glycol on the Morphology,Structure,and Photoelectrochemical Properties of WO3 Films Prepared by Spin-Coating Method
Tungsten trioxide(WO3)has been widely studied as a photocatalyst due to its excellent visible light response and photochemical properties.In this study,ammonium metatungstate hydrate was dissolved in an organic solvent composed of N,N-dimethylformamide(DMF),ethylene glycol,and anhydrous ethanol to form a precursor solution.WO3 films were prepared on FTO conductive glass by spin-coating method.The morphology,structure,and photoelectrochemical properties of WO3 films prepared from different precursor solution were investigated.The crystal structure and morphology of WO3 films were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),and Raman spectroscopy.The photoelectrochemical properties of the films were evaluated using UV-visible spectrophotometry and an electrochemical workstation.The results showed that the addition of ethylene glycol in the precursor solution resulted in more uniform and smoother surface and thickness of the WO3 films.The crystal structure of the films remained mostly unaffected,with a slight decrease in crystallinity.After the addition of EG,the optical absorption of the films is enhanced,and the bandgap is slightly reduced.Consequently,the photocurrent density is significantly increased,providing a method for the low-cost and efficient preparation of WO3 photocatalytic materials.
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