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<p>In this study, a series of chalcogenide-based semiconductor nanomaterials, such as CdSe, CdS<sub>0.2</sub>Se<sub>0.8</sub>, CdS<sub>0.4</sub>Se<sub>0.6</sub>, CdS<sub>0.6</sub>Se<sub>0.4</sub>, CdS<sub>0.8</sub>Se<sub>0.2</sub>, and CdS, were synthesized via a hydrothermal synthesis and systematically evaluated for their potential in environmental remediation applications. The synthesized nanomaterials were characterized for their structural, morphological, and optical properties. XRD analysis confirmed that all samples crystallized in a hexagonal crystal structure. Morphological analysis using HRTEM and SEM revealed that the nanoparticles exhibited asymmetric shapes and sizes, which varied with changes in the selenium to sulfur composition. XPS confirmed the presence of cadmium, sulfur, and selenium in the nanomaterials. Optical characterization through UV–Vis spectroscopy revealed a tunable band gap ranging from 1.84&#xa0;eV for CdSe to 2.47&#xa0;eV for CdS, positioning these materials within the visible spectrum and making them suitable for photocatalytic applications. PL analysis demonstrated a blue shift in the emission peaks, from 726 to 520&#xa0;nm, as the selenium content decreased. The photocatalytic efficiency was evaluated by the degradation of Methyl Orange (MO) dye under visible-light irradiation. CdS photocatalyst exhibited the highest degradation efficiency (80.76%), while CdSe showed the lowest efficiency (49.27%) within 400&#xa0;min of visible-light irradiation. The enhanced photocatalytic performance observed with increasing sulfur content is attributed to favourable band gap tuning, improved optical absorption, and changes in particle morphology.</p>

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Tunable selenium–sulfur composition in CdSxSe1−x nanomaterials: structural and optical insights for methyl orange dye degradation

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Shweta N. Jamble,
  • Rekha Rajput,
  • Rohidas B. Kale

摘要

In this study, a series of chalcogenide-based semiconductor nanomaterials, such as CdSe, CdS0.2Se0.8, CdS0.4Se0.6, CdS0.6Se0.4, CdS0.8Se0.2, and CdS, were synthesized via a hydrothermal synthesis and systematically evaluated for their potential in environmental remediation applications. The synthesized nanomaterials were characterized for their structural, morphological, and optical properties. XRD analysis confirmed that all samples crystallized in a hexagonal crystal structure. Morphological analysis using HRTEM and SEM revealed that the nanoparticles exhibited asymmetric shapes and sizes, which varied with changes in the selenium to sulfur composition. XPS confirmed the presence of cadmium, sulfur, and selenium in the nanomaterials. Optical characterization through UV–Vis spectroscopy revealed a tunable band gap ranging from 1.84 eV for CdSe to 2.47 eV for CdS, positioning these materials within the visible spectrum and making them suitable for photocatalytic applications. PL analysis demonstrated a blue shift in the emission peaks, from 726 to 520 nm, as the selenium content decreased. The photocatalytic efficiency was evaluated by the degradation of Methyl Orange (MO) dye under visible-light irradiation. CdS photocatalyst exhibited the highest degradation efficiency (80.76%), while CdSe showed the lowest efficiency (49.27%) within 400 min of visible-light irradiation. The enhanced photocatalytic performance observed with increasing sulfur content is attributed to favourable band gap tuning, improved optical absorption, and changes in particle morphology.