Sol-gel synthesis of LaFeO3 nanoparticles for gas sensing application
Author(s): Monali E. Niphade, Uglal P. Shinde, Arun V. Patil
Publication #: 2510006
Date of Publication: 07.10.2025
Country: India
Pages: 1-10
Published In: Volume 11 Issue 5 October-2025
Abstract
In the present research work the LaFeO3 nanoparticles were successfully synthesis by sol-gel method. LaFeO₃ nanoparticles were successfully synthesized via a sol-gel route using ferric nitrate nonahydrate and lanthanum nitrate hexahydrate as precursors, with ascorbic acid dissolved in ethylene glycol and deionized water as the chelating agent. The obtained gel was dried, and calcined at 400 °C to achieve phase-pure LaFeO₃ nanoparticles. These nanoparticles were used for the fabrication of thick films by the conventional screen-printing method on glass substrates, employing a 70:30 ratio of inorganic to organic binders (ethyl cellulose and butyl carbitol acetate) to form a thixotropic paste. The prepared films were annealed at 400 °C to enhance stability and remove organic residues. The structural, morphological, and compositional properties of the films were systematically analyzed using X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-ray Spectroscopy (EDX). Gas sensing performance was investigated against selected gases, including NH₃, LPG, CO, ethanol, and SO₂. The LaFeO₃ films exhibited maximum sensitivity (58.13%) and excellent selectivity toward ethanol gas at 160 °C with 1000 ppm concentration, along with response and recovery times of 23 and 104 seconds, respectively. The result demonstrate the potential of LaFeO₃ thick films as efficient ethanol gas sensors with good stability and reproducibility.
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