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<p>Incorporating vanadium into titanium dioxide (TiO<sub>2</sub>) nanocrystals has emerged as a significant research area of optical applications. Doping TiO<sub>2</sub> with V has been shown to enhance its performance, indicating a need for a comprehensive investigation into the structural effects of V doping. Understanding its influence on the anatase-to-rutile phase transition and subsequent modifications in the bandgap of TiO<sub>2</sub> is essential for optimizing the functionality in various applications. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), UV–Vis spectroscopy, and photoluminescence spectroscopy were employed to analyze the characteristics.&#xa0;The energy bandgap decreases from 3.22&#xa0;eV for pure TiO<sub>2</sub> to 2.28&#xa0;eV for 5&#xa0;mol% V-doped TiO<sub>2</sub>, indicating enhanced visible light absorption. Influenced by V doping, PL spectroscopy revealed the various defect states, including oxygen vacancies and F-centers. These defect states are crucial in stabilizing specific crystal phases and charge transfer processes, improving photoresponse and optoelectronic performance. The findings provide a fundamental understanding of dopant-induced structural transformations and their direct correlation with functional enhancements, contributing to the development of effective nanomaterials.</p>

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Structural Influence of Vanadium on the Anatase-to-Rutile Phase Transition and Bandgap Modification in TiO2 Nanocrystals

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Suriyong Prachakiew,
  • Samor Boonphan,
  • Yanee Keereeta,
  • Chatdanai Boonruang,
  • Arrak Klinbumrung

摘要

Incorporating vanadium into titanium dioxide (TiO2) nanocrystals has emerged as a significant research area of optical applications. Doping TiO2 with V has been shown to enhance its performance, indicating a need for a comprehensive investigation into the structural effects of V doping. Understanding its influence on the anatase-to-rutile phase transition and subsequent modifications in the bandgap of TiO2 is essential for optimizing the functionality in various applications. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), UV–Vis spectroscopy, and photoluminescence spectroscopy were employed to analyze the characteristics. The energy bandgap decreases from 3.22 eV for pure TiO2 to 2.28 eV for 5 mol% V-doped TiO2, indicating enhanced visible light absorption. Influenced by V doping, PL spectroscopy revealed the various defect states, including oxygen vacancies and F-centers. These defect states are crucial in stabilizing specific crystal phases and charge transfer processes, improving photoresponse and optoelectronic performance. The findings provide a fundamental understanding of dopant-induced structural transformations and their direct correlation with functional enhancements, contributing to the development of effective nanomaterials.