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<p>The demand for accurate acetone gas sensors in low-concentration detection is rapidly increasing in applications such as air safety monitoring and non-invasive diabetes diagnosis. In this study, a freeze-drying strategy is developed to synthesize LaFeO<sub>3</sub> with abundant oxygen vacancies and enhanced specific area. The acetone sensors based on above LaFeO<sub>3</sub> exhibit high response and excellent selectivity. Typically, the response is 125 for 50 ppm acetone, nearly 1.5 times that of materials prepared by the sol-gel method, and the detection limit is 19.3 ppb. The ppb-level acetone detection of the freeze-dried LaFeO<sub>3</sub> nanoparticle sensor can be attributed to the abundant oxygen vacancies and enhanced specific surface area, which provides more active sites for sensing. This not only provides a promising strategy for improving acetone sensor performance, but also lays the foundation for tuning the micro-nanostructure to enhance gas sensor capabilities.</p>

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ppb-level acetone sensors based on LaFeO3 synthesized by freeze-drying

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Le-le Zhang,
  • Xing Huang,
  • Yong Cai,
  • Ming Zhang

摘要

The demand for accurate acetone gas sensors in low-concentration detection is rapidly increasing in applications such as air safety monitoring and non-invasive diabetes diagnosis. In this study, a freeze-drying strategy is developed to synthesize LaFeO3 with abundant oxygen vacancies and enhanced specific area. The acetone sensors based on above LaFeO3 exhibit high response and excellent selectivity. Typically, the response is 125 for 50 ppm acetone, nearly 1.5 times that of materials prepared by the sol-gel method, and the detection limit is 19.3 ppb. The ppb-level acetone detection of the freeze-dried LaFeO3 nanoparticle sensor can be attributed to the abundant oxygen vacancies and enhanced specific surface area, which provides more active sites for sensing. This not only provides a promising strategy for improving acetone sensor performance, but also lays the foundation for tuning the micro-nanostructure to enhance gas sensor capabilities.