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<p>The primary aim of this research is to investigate the structural, optical, and surface properties of LiMn₂O₄ thin films deposited via a practical spray pyrolysis method at varied substrate temperatures (300, 350, 400, and 450&#xa0;°C). The structural, optical, and surface characteristics of the synthesized films were analyzed using X-ray diffraction (XRD), UV-visible spectroscopy (UV), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDAX), Fourier-transform infrared spectroscopy (FTIR), and photoluminescence (PL) spectroscopy. XRD analysis confirmed a cubic spinel structure for the LiMn₂O₄ thin films, showing a preferred orientation along the (111) plane. Optical studies revealed a band gap energy of 2.457&#xa0;eV for the films. SEM micrographs showed a spongy network structure within the LiMn₂O₄ films. FTIR spectra indicated characteristic stretching modes associated with O-Mn-O, Mn-O, and Li-O bonds at approximately 411&#xa0;cm⁻¹, 488&#xa0;cm⁻¹, and 525&#xa0;cm⁻¹, respectively. Photoluminescence spectroscopy demonstrated strong photoluminescent properties in the films. Furthermore, cyclic voltammetry analysis revealed that the LiMn₂O₄ thin films exhibited good electrochemical performance.</p>

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Tailoring the properties of LiMn₂O₄ thin films via spray pyrolysis at different substrate temperatures for energy storage applications

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • A. Jasmine Agnal,
  • E. Ashlyn Kirupa,
  • R. Shabu

摘要

The primary aim of this research is to investigate the structural, optical, and surface properties of LiMn₂O₄ thin films deposited via a practical spray pyrolysis method at varied substrate temperatures (300, 350, 400, and 450 °C). The structural, optical, and surface characteristics of the synthesized films were analyzed using X-ray diffraction (XRD), UV-visible spectroscopy (UV), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDAX), Fourier-transform infrared spectroscopy (FTIR), and photoluminescence (PL) spectroscopy. XRD analysis confirmed a cubic spinel structure for the LiMn₂O₄ thin films, showing a preferred orientation along the (111) plane. Optical studies revealed a band gap energy of 2.457 eV for the films. SEM micrographs showed a spongy network structure within the LiMn₂O₄ films. FTIR spectra indicated characteristic stretching modes associated with O-Mn-O, Mn-O, and Li-O bonds at approximately 411 cm⁻¹, 488 cm⁻¹, and 525 cm⁻¹, respectively. Photoluminescence spectroscopy demonstrated strong photoluminescent properties in the films. Furthermore, cyclic voltammetry analysis revealed that the LiMn₂O₄ thin films exhibited good electrochemical performance.