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<p>Tungsten Trioxide (WO<sub>3</sub>) nanoparticles (NPs) were synthesized using biodegradable starch as a stabilizing and capping agent. The as-prepared samples were annealed at 100&#xa0;°C, 200&#xa0;°C, 400&#xa0;°C, and 600&#xa0;°C. Phase purity of the annealed NPs was confirmed from the XRD pattern and Raman analysis. The NPs annealed at lower temperatures showed hexagonal phase of WO<sub>3</sub> with lesser crystallinity. With increasing annealing temperature, increased crystallinity with monoclinic phase of WO<sub>3</sub> was observed. Particles with smaller size and agglomeration of particles with rise in temperature can be well observed in FESEM images. The samples annealed at 400&#xa0;°C and 600&#xa0;°C were further used as photocatalysts for the degradation of RhB and CV dye solution under direct sunlight. Rate constant and degradation efficiencies were calculated. The dielectric constant and loss reduced with frequency, according to dielectric studies conducted across a wide frequency range (100&#xa0;Hz to 120&#xa0;MHz). At higher temperatures, AC conductivity improved, and the sample annealed at 600&#xa0;°C showed the best dielectric performance. These results highlight how important annealing is for adjusting the optical, dielectric, photocatalytic, and structural characteristics of WO₃ nanoparticles for a variety of uses.</p>

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Study the effect of annealing temperature on photocatalytic and dielectric properties of starch-assisted WO3 nanoparticles

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • Manjula Tiwari,
  • G. C. Joshi,
  • Amit Joshi,
  • Chandra Shekhar Joshi

摘要

Tungsten Trioxide (WO3) nanoparticles (NPs) were synthesized using biodegradable starch as a stabilizing and capping agent. The as-prepared samples were annealed at 100 °C, 200 °C, 400 °C, and 600 °C. Phase purity of the annealed NPs was confirmed from the XRD pattern and Raman analysis. The NPs annealed at lower temperatures showed hexagonal phase of WO3 with lesser crystallinity. With increasing annealing temperature, increased crystallinity with monoclinic phase of WO3 was observed. Particles with smaller size and agglomeration of particles with rise in temperature can be well observed in FESEM images. The samples annealed at 400 °C and 600 °C were further used as photocatalysts for the degradation of RhB and CV dye solution under direct sunlight. Rate constant and degradation efficiencies were calculated. The dielectric constant and loss reduced with frequency, according to dielectric studies conducted across a wide frequency range (100 Hz to 120 MHz). At higher temperatures, AC conductivity improved, and the sample annealed at 600 °C showed the best dielectric performance. These results highlight how important annealing is for adjusting the optical, dielectric, photocatalytic, and structural characteristics of WO₃ nanoparticles for a variety of uses.