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<p>In this study, we investigated the thermoelectric properties of undoped and Fe/Co-doped ZnS NPs, synthesized by the co-precipitation method. The samples were characterized using several characterization techniques, such as X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and measurements of the Seebeck coefficient, electrical conductivity, and power factor. The XRD pattern confirmed the zinc blende (cubic) structure for pure and Fe/Co-doped ZnS NPs. XRD data also confirmed that lattice distortion occurs due to doping because of the difference in the ionic radii of Fe and Co compared with Zn. The Raman spectrum revealed two peaks at 255 cm<sup>−1</sup> and 348 cm<sup>−1</sup>, which are assigned to TO and LO modes of cubic ZnS, respectively. SEM images demonstrated that the crystallite size decreased due to the doping of Fe and Co because of dopant-induced lattice strain and inhibited grain growth. The Seebeck coefficient and electrical conductivity were measured in the temperature range of 25–100 °C. Both parameters increased with temperature and doping concentration, resulting in an enhanced power factor. Among undoped ZnS, Co-doped ZnS, and Fe/Co co-doped ZnS, the Fe/Co co-doped Zn<sub>0.98</sub>Fe<sub>0.01</sub>Co<sub>0.01</sub>S showed the highest thermoelectric performance. This work represents one of the first experimental studies on Fe/Co co-doping in ZnS for thermoelectric enhancement.</p>

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Investigation of the thermoelectric properties of Fe/Co doped ZnS nanoparticles

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Rashid Awan,
  • Hadia Noor,
  • M. Shujaat Hussain,
  • Ali Raza,
  • Abdul Ghaffar,
  • Sajid Hameed,
  • Adnan Ali,
  • Khalid Mehmood,
  • Kaneez Fatima

摘要

In this study, we investigated the thermoelectric properties of undoped and Fe/Co-doped ZnS NPs, synthesized by the co-precipitation method. The samples were characterized using several characterization techniques, such as X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and measurements of the Seebeck coefficient, electrical conductivity, and power factor. The XRD pattern confirmed the zinc blende (cubic) structure for pure and Fe/Co-doped ZnS NPs. XRD data also confirmed that lattice distortion occurs due to doping because of the difference in the ionic radii of Fe and Co compared with Zn. The Raman spectrum revealed two peaks at 255 cm−1 and 348 cm−1, which are assigned to TO and LO modes of cubic ZnS, respectively. SEM images demonstrated that the crystallite size decreased due to the doping of Fe and Co because of dopant-induced lattice strain and inhibited grain growth. The Seebeck coefficient and electrical conductivity were measured in the temperature range of 25–100 °C. Both parameters increased with temperature and doping concentration, resulting in an enhanced power factor. Among undoped ZnS, Co-doped ZnS, and Fe/Co co-doped ZnS, the Fe/Co co-doped Zn0.98Fe0.01Co0.01S showed the highest thermoelectric performance. This work represents one of the first experimental studies on Fe/Co co-doping in ZnS for thermoelectric enhancement.