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<p>This study reports the successful extracellular biosynthesis of lead sulfide (PbS) nanoparticles using non-motile, Gram-variable <i>Micrococcus luteus</i> bacteria. Optimization studies revealed optimal growth conditions for bacterial biomass and PbS production at room temperature, pH 7, and 96&#xa0;h of incubation. The influence of precursor concentration on the growth and properties of PbS nanostructures was investigated. Characterization techniques, including X-ray diffraction, scanning electron microscopy, and FTIR spectroscopy, confirmed the formation of spherical, pure-phase PbS nanoparticles with sizes ranging from 150 to 250&#xa0;nm. UV–visible absorption spectroscopy demonstrated strong absorption in the near-infrared region, indicative of the bandgap of PbS. Furthermore, an increase in precursor concentration resulted in a blue shift of the band gap. Utilizing these biogenic PbS nanoparticles, a high-performance photodetector device was fabricated with the architecture FTO/TiO<sub>2</sub>/PbS/PANI/NiS/V<sub>2</sub>O<sub>5</sub>/Pt. The device exhibited excellent stability and repeatability in ON-OFF switching cycles, with a high detectivity of 30.9 × 10<sup>7</sup> Jones and fast response times of 0.94&#xa0;s (rise time) and 0.478&#xa0;s (decay time). These findings demonstrate the potential of biogenic PbS nanoparticles for developing high-performance optoelectronic devices.</p>

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Biogenic synthesis of PbS nanoparticles by Micrococcus luteus and their application in high-performance photodetectors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月24日

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  • Hemant Tarkas,
  • Dhanashree Kandivkar,
  • Abhilasha Rokade,
  • Vaishali Waman,
  • Narendra Pardhi,
  • Priti Vairale,
  • Shashikant P. Patole,
  • Sandesh Jadkar

摘要

This study reports the successful extracellular biosynthesis of lead sulfide (PbS) nanoparticles using non-motile, Gram-variable Micrococcus luteus bacteria. Optimization studies revealed optimal growth conditions for bacterial biomass and PbS production at room temperature, pH 7, and 96 h of incubation. The influence of precursor concentration on the growth and properties of PbS nanostructures was investigated. Characterization techniques, including X-ray diffraction, scanning electron microscopy, and FTIR spectroscopy, confirmed the formation of spherical, pure-phase PbS nanoparticles with sizes ranging from 150 to 250 nm. UV–visible absorption spectroscopy demonstrated strong absorption in the near-infrared region, indicative of the bandgap of PbS. Furthermore, an increase in precursor concentration resulted in a blue shift of the band gap. Utilizing these biogenic PbS nanoparticles, a high-performance photodetector device was fabricated with the architecture FTO/TiO2/PbS/PANI/NiS/V2O5/Pt. The device exhibited excellent stability and repeatability in ON-OFF switching cycles, with a high detectivity of 30.9 × 107 Jones and fast response times of 0.94 s (rise time) and 0.478 s (decay time). These findings demonstrate the potential of biogenic PbS nanoparticles for developing high-performance optoelectronic devices.