Scholarlink

<p>Bi<sub>2</sub>O<sub>3</sub> thin films were prepared on glass substrates using a glycine-assisted sol-gel method. The effects of annealing temperature (360–520°C) on the phase composition, microstructure, optical properties, and photocatalytic activity of the films were systematically investigated. The results show that pure-phase <i>β</i>-Bi<sub>2</sub>O<sub>3</sub> thin films can be obtained by annealing at 380°C, while increasing the temperature leads to the gradual emergence of the oxygen-deficient Bi<sub>2</sub>O<sub>2.3</sub> and monoclinic <i>α</i>-Bi<sub>2</sub>O<sub>3</sub> phases. The grain size increases with temperature up to 460°C and then decreases. The films exhibit a dense and uniform nanoparticle morphology at lower temperatures, whereas pore defects gradually appear and the structure transforms into a lamellar morphology when the temperature exceeds 460°C. All films show good transmittance in the visible region (70–85%), with an optical bandgap tunable in the range of 2.29–3.15 eV. The thin film annealed at 460°C achieves a degradation efficiency of 97.2% for methylene blue within 120 min and maintains stable performance after five cycles. Active species trapping experiments confirm that superoxide radicals (·O<sub>2</sub><sup>−</sup>) and hydroxyl radicals (·OH) are the primary active species. This study reveals the mechanism by which annealing temperature modulates the structure and properties of <i>β</i>-Bi<sub>2</sub>O<sub>3</sub> thin films, providing experimental support for the controllable preparation of high-performance photocatalytic thin films.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Temperature-Dependent Controlled Synthesis of β-Bi2O3 Thin Films via a Glycine-Assisted Sol-Gel Method

  • 期刊论文

  • 发表日期：

    2026年8月4日

查看全文
  • Ruobing Feng,
  • Muyan Dai,
  • Guanghao Liu,
  • Yonghui Jin,
  • Ming Yi,
  • Bowen Zhang,
  • Ying Wang,
  • Ning Zhang,
  • Nan Wang

摘要

Bi2O3 thin films were prepared on glass substrates using a glycine-assisted sol-gel method. The effects of annealing temperature (360–520°C) on the phase composition, microstructure, optical properties, and photocatalytic activity of the films were systematically investigated. The results show that pure-phase β-Bi2O3 thin films can be obtained by annealing at 380°C, while increasing the temperature leads to the gradual emergence of the oxygen-deficient Bi2O2.3 and monoclinic α-Bi2O3 phases. The grain size increases with temperature up to 460°C and then decreases. The films exhibit a dense and uniform nanoparticle morphology at lower temperatures, whereas pore defects gradually appear and the structure transforms into a lamellar morphology when the temperature exceeds 460°C. All films show good transmittance in the visible region (70–85%), with an optical bandgap tunable in the range of 2.29–3.15 eV. The thin film annealed at 460°C achieves a degradation efficiency of 97.2% for methylene blue within 120 min and maintains stable performance after five cycles. Active species trapping experiments confirm that superoxide radicals (·O2−) and hydroxyl radicals (·OH) are the primary active species. This study reveals the mechanism by which annealing temperature modulates the structure and properties of β-Bi2O3 thin films, providing experimental support for the controllable preparation of high-performance photocatalytic thin films.