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<p>In this work, a 10% concentration of Sr<sup>2+</sup> ion is selected to replace Ba<sup>2+</sup> ones in the La<sub>0.75</sub>Ba<sub>0.25</sub>FeO<sub>3</sub> (LBFO) compound to enhance their gas sensing properties. The obtained findings suggest that the substitution of such an amount of barium ions does not affect the orthorhombic structure (space group Pnma) but leads to a distortion in the FeO<sub>6</sub> octahedron of the perovskite materials. Meanwhile, the Raman spectroscopy confirms well the distortion of the FeO<sub>6</sub> octahedron. Both LBFO and LBSFO (La<sub>0.75</sub>Ba<sub>0.15</sub>Sr<sub>0.1</sub>FeO<sub>3</sub>) compounds present very small values of crystallite and particle size, with a remarkable decrease when introducing Sr<sup>2+</sup> ions. The studied compounds, with band gap energies around 2.4&#xa0;eV, are of high utility for photocatalytic applications. Importantly, the La<sub>0.75</sub>Ba<sub>0.15</sub>Sr<sub>0.1</sub>FeO<sub>3</sub> compound shows higher response values toward acetone and ethanol gases even at low gas concentrations (5&#xa0;ppm). Response and recovery times were calculated and found to be less than 40 and 20&#xa0;s, respectively.</p>

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Sr-doped LaBaFeO₃ nanoparticles: structural characteristics and application in gas sensing of acetone and ethanol vapors

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Aref Omri,
  • A. Benali,
  • A. Tozri,
  • N. Zaidi,
  • E. Dhahri,
  • Lin Peng,
  • Jiangtao Wu,
  • B. F. O. Costa

摘要

In this work, a 10% concentration of Sr2+ ion is selected to replace Ba2+ ones in the La0.75Ba0.25FeO3 (LBFO) compound to enhance their gas sensing properties. The obtained findings suggest that the substitution of such an amount of barium ions does not affect the orthorhombic structure (space group Pnma) but leads to a distortion in the FeO6 octahedron of the perovskite materials. Meanwhile, the Raman spectroscopy confirms well the distortion of the FeO6 octahedron. Both LBFO and LBSFO (La0.75Ba0.15Sr0.1FeO3) compounds present very small values of crystallite and particle size, with a remarkable decrease when introducing Sr2+ ions. The studied compounds, with band gap energies around 2.4 eV, are of high utility for photocatalytic applications. Importantly, the La0.75Ba0.15Sr0.1FeO3 compound shows higher response values toward acetone and ethanol gases even at low gas concentrations (5 ppm). Response and recovery times were calculated and found to be less than 40 and 20 s, respectively.