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<p>The pure and sodium dodecyl sulphate (SDS)-assisted CoFe<sub>2</sub>O<sub>4</sub> nanoparticles were prepared by hydrothermal method at the optimized reaction temperature of 110&#xa0;°C. The XRD pattern revealed the cubic spinel structure and crystallite size decreased with the addition of surfactant. FTIR spectra confirmed the metal oxide bands in tetrahedral and octahedral sites. UV-DRS spectra exhibited an increase in bandgap with the addition of surfactant. The FESEM analysis also confirmed that the prepared samples had a cubic-like structure. From magnetic study, a soft ferromagnetic behaviour was observed at ambient temperature for the SDS-assisted CoFe<sub>2</sub>O<sub>4</sub> nanoparticles. Noteworthy, the CV analysis revealed the pseudocapacitive behaviour for pure and SDS-assisted CoFe<sub>2</sub>O<sub>4</sub> samples, emphasizing their potential for diverse electrochemical applications. At room temperature, LPG exhibited a notably high selective response, with a reading of 103 s for a concentration of 6 ppm, surpassing the responses of other gases tested.</p>

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Unveiling the role of surfactant SDS concentration in controlling the physical, electrochemical and LPG gas sensing characteristics of CoFe2O4 nanoparticles

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • R. Ilakkiya,
  • L. Iyyappan,
  • S. Jayasri,
  • Bindiya Dey,
  • C. Manoharan

摘要

The pure and sodium dodecyl sulphate (SDS)-assisted CoFe2O4 nanoparticles were prepared by hydrothermal method at the optimized reaction temperature of 110 °C. The XRD pattern revealed the cubic spinel structure and crystallite size decreased with the addition of surfactant. FTIR spectra confirmed the metal oxide bands in tetrahedral and octahedral sites. UV-DRS spectra exhibited an increase in bandgap with the addition of surfactant. The FESEM analysis also confirmed that the prepared samples had a cubic-like structure. From magnetic study, a soft ferromagnetic behaviour was observed at ambient temperature for the SDS-assisted CoFe2O4 nanoparticles. Noteworthy, the CV analysis revealed the pseudocapacitive behaviour for pure and SDS-assisted CoFe2O4 samples, emphasizing their potential for diverse electrochemical applications. At room temperature, LPG exhibited a notably high selective response, with a reading of 103 s for a concentration of 6 ppm, surpassing the responses of other gases tested.