Scholarlink

<p>TiO<sub>2</sub> nanoparticles were synthesized via a sol–gel method and systematically investigated for their structural, optical, and humidity sensing properties for environmental and smart device applications. X-ray diffraction confirmed a mixed anatase–rutile phase with high crystallinity and an average crystallite size of 7.93&#xa0;nm, while Raman spectroscopy indicated the dominance of the rutile phase after annealing at 700&#xa0;°C. FESEM analysis revealed a dense polycrystalline morphology with grain sizes in the micrometer and sub-micrometer range, and EDS confirmed elemental purity. UV–visible spectroscopy showed strong ultraviolet absorption with indirect and direct optical band gaps of 2.96 and 3.34&#xa0;eV, respectively. The TiO<sub>2</sub>-based humidity sensor exhibited a pronounced resistance decrease from ~ 1000 KΩ at 20% RH to ~ 150 KΩ at 90% RH at room temperature, demonstrating high sensitivity and a wide dynamic range. The sensing mechanism is governed by chemisorption at low humidity and proton-assisted ionic conduction at higher humidity levels. The sensor showed fast response–recovery behavior, low hysteresis, excellent repeatability, and stable performance with a response of ~ 77–78% maintained over 15&#xa0;days at 60% RH. These results demonstrate that sol–gel-derived TiO<sub>2</sub> nanoparticles are promising candidates for reliable, low-cost, and room-temperature humidity sensing applications.</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

Synthesis, characterization and humidity sensing properties of TiO2 nanoparticles for environmental and smart device applications

  • 期刊论文

  • 发表日期：

    2026年2月9日

查看全文
  • Medikonda RadhaRani,
  • Babu Katta Rajesh,
  • Srilali Siragam

摘要

TiO2 nanoparticles were synthesized via a sol–gel method and systematically investigated for their structural, optical, and humidity sensing properties for environmental and smart device applications. X-ray diffraction confirmed a mixed anatase–rutile phase with high crystallinity and an average crystallite size of 7.93 nm, while Raman spectroscopy indicated the dominance of the rutile phase after annealing at 700 °C. FESEM analysis revealed a dense polycrystalline morphology with grain sizes in the micrometer and sub-micrometer range, and EDS confirmed elemental purity. UV–visible spectroscopy showed strong ultraviolet absorption with indirect and direct optical band gaps of 2.96 and 3.34 eV, respectively. The TiO2-based humidity sensor exhibited a pronounced resistance decrease from ~ 1000 KΩ at 20% RH to ~ 150 KΩ at 90% RH at room temperature, demonstrating high sensitivity and a wide dynamic range. The sensing mechanism is governed by chemisorption at low humidity and proton-assisted ionic conduction at higher humidity levels. The sensor showed fast response–recovery behavior, low hysteresis, excellent repeatability, and stable performance with a response of ~ 77–78% maintained over 15 days at 60% RH. These results demonstrate that sol–gel-derived TiO2 nanoparticles are promising candidates for reliable, low-cost, and room-temperature humidity sensing applications.