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<p>This study investigates the fabrication of BiVO<sub>4</sub> and BiVO<sub>4</sub>@g-C<sub>3</sub>N<sub>4</sub> nanocomposite thin films via spin coating to examine the structural and optical changes induced by g-C<sub>3</sub>N<sub>4</sub> incorporation. X-ray diffraction (XRD) confirmed the formation of monoclinic scheelite-phase BiVO<sub>4</sub>. The diffraction peaks corresponding to V<sub>2</sub>O<sub>5</sub> were observed for the film prepared from bismuth vanadate oxide powder (BVO-1), whereas the V<sub>2</sub>O<sub>5</sub> peak was not detected in the sample prepared from BiVO<sub>4</sub>@g-C<sub>3</sub>N<sub>4</sub> (BVO-2). Scanning electron microscopy (SEM) revealed a distinct fiber-like morphology for BVO-1 and a porous structure for BVO-2. Energy-dispersive spectroscopy (EDS) confirmed the uniform distribution of Bi, V, and O in the film. The bandgap energies (E<sub>g</sub>) were determined to be 2.21&#xa0;eV for BVO-1 and 2.52&#xa0;eV for BVO-2, respectively. These structural and optical enhancements have&#xa0;improved the visible-light absorption and charge separation, making the films as the&#xa0;promising candidates for photocatalytic applications, such as the degradation of organic dyes, antibiotics, and pollutants, as well as water splitting under visible light.</p> Graphical abstract <p></p>

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Structural and optical properties of BiVO4 and BiVO4@g-C3N4 nanocomposite thin films by spin-coating process

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Suresh Sagadevan,
  • Dev Bahadur Khadka,
  • Minh-Vien Le,
  • Tetsuo Soga

摘要

This study investigates the fabrication of BiVO4 and BiVO4@g-C3N4 nanocomposite thin films via spin coating to examine the structural and optical changes induced by g-C3N4 incorporation. X-ray diffraction (XRD) confirmed the formation of monoclinic scheelite-phase BiVO4. The diffraction peaks corresponding to V2O5 were observed for the film prepared from bismuth vanadate oxide powder (BVO-1), whereas the V2O5 peak was not detected in the sample prepared from BiVO4@g-C3N4 (BVO-2). Scanning electron microscopy (SEM) revealed a distinct fiber-like morphology for BVO-1 and a porous structure for BVO-2. Energy-dispersive spectroscopy (EDS) confirmed the uniform distribution of Bi, V, and O in the film. The bandgap energies (Eg) were determined to be 2.21 eV for BVO-1 and 2.52 eV for BVO-2, respectively. These structural and optical enhancements have improved the visible-light absorption and charge separation, making the films as the promising candidates for photocatalytic applications, such as the degradation of organic dyes, antibiotics, and pollutants, as well as water splitting under visible light.

Graphical abstract