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<p>MoS<sub>2</sub> thin films were successfully formulated using the spray pyrolysis technique and investigated for their structural, optical, electrical and gas sensing characteristics. The precursor-based formulation produced uniform nanocrystalline MoS<sub>2</sub> layers, as confirmed by XRD, FESEM and EDX analyses, revealing a well-defined hexagonal phase, nanoscale grain morphology and near-stoichiometric Mo:S ratio. Optical studies indicated strong UV–visible absorption and a direct band gap of 2.11&#xa0;eV, consistent with semiconducting behavior. Electrical measurements demonstrated stable temperature-dependent conductivity and suitable activation energies for gas sensing applications. The MoS<sub>2</sub> thin films exhibited excellent sensing performance, with LPG showing the highest sensitivity among all tested gases. A maximum sensitivity of 91.96% was achieved at 60&#xa0;°C for 200&#xa0;ppm LPG, supported by fast response (6&#xa0;s) and recovery (51&#xa0;s) times, along with good reusability and long-term stability over six weeks. The enhanced LPG selectivity is attributed to the strong interaction between sulfur-containing LPG components and sulfur-rich active sites on MoS<sub>2</sub>. These results highlight the potential of spray-pyrolyzed MoS<sub>2</sub> thin films as efficient, low-temperature, and highly selective gas sensing materials for practical LPG detection applications.</p>

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MoS2 thin films: formulation, characterization and performance in gas sensing

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • Chetan R. Yewale,
  • Satish Mandawade,
  • Rajendra V. Wagh,
  • Anil B. Patil,
  • Sajid Naeem,
  • Vikas V. Deshmane,
  • Umesh J. Tupe,
  • Arun V. Patil

摘要

MoS2 thin films were successfully formulated using the spray pyrolysis technique and investigated for their structural, optical, electrical and gas sensing characteristics. The precursor-based formulation produced uniform nanocrystalline MoS2 layers, as confirmed by XRD, FESEM and EDX analyses, revealing a well-defined hexagonal phase, nanoscale grain morphology and near-stoichiometric Mo:S ratio. Optical studies indicated strong UV–visible absorption and a direct band gap of 2.11 eV, consistent with semiconducting behavior. Electrical measurements demonstrated stable temperature-dependent conductivity and suitable activation energies for gas sensing applications. The MoS2 thin films exhibited excellent sensing performance, with LPG showing the highest sensitivity among all tested gases. A maximum sensitivity of 91.96% was achieved at 60 °C for 200 ppm LPG, supported by fast response (6 s) and recovery (51 s) times, along with good reusability and long-term stability over six weeks. The enhanced LPG selectivity is attributed to the strong interaction between sulfur-containing LPG components and sulfur-rich active sites on MoS2. These results highlight the potential of spray-pyrolyzed MoS2 thin films as efficient, low-temperature, and highly selective gas sensing materials for practical LPG detection applications.