Scholarlink

<p>Metal oxide semiconductors are widely employed to enhance the performance of hydrogen sensors. In this work, a simple sol-gel method was used to synthesise TiO<sub>2</sub> followed by heat treatment (400, 600, or 800&#xa0;°C.) to obtain materials with predominantly tetragonal (anatase-rutile), mixed tetragonal-orthorhombic, and mixed tetragonal-tetragonal (anatase-rutile) crystal structures, respectively. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and UV-visible diffuse reflectance spectroscopy (UV-visible DRS). The results show that TiO<sub>2</sub> annealed at 600&#xa0;°C exhibits the best H<sub>2</sub> sensing performance, ensuring a sensor response (Ra/Rg) of approximately 3.7 at 3000 ppm and fast response and recovery times of 3.5 and 11.9&#xa0;s, respectively.</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

Influence of tetragonal and mixed-phase transitions in TiO2 on fast hydrogen gas sensing

  • 期刊论文

  • 发表日期：

    2026年6月25日

查看全文
  • Yassine Alaya,
  • Bilel Chouchene,
  • Noureddine Bouguila,
  • Claudia Espro,
  • Raphaël Schneider,
  • Giovanni Neri

摘要

Metal oxide semiconductors are widely employed to enhance the performance of hydrogen sensors. In this work, a simple sol-gel method was used to synthesise TiO2 followed by heat treatment (400, 600, or 800 °C.) to obtain materials with predominantly tetragonal (anatase-rutile), mixed tetragonal-orthorhombic, and mixed tetragonal-tetragonal (anatase-rutile) crystal structures, respectively. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and UV-visible diffuse reflectance spectroscopy (UV-visible DRS). The results show that TiO2 annealed at 600 °C exhibits the best H2 sensing performance, ensuring a sensor response (Ra/Rg) of approximately 3.7 at 3000 ppm and fast response and recovery times of 3.5 and 11.9 s, respectively.