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<p>This study presents a rare and unprecedented investigation into the long-term photostability and physicochemical integrity of fungal-capped CdS nanoparticles preserved for more than 15&#xa0;years since their original biomimetic synthesis. Only a very limited quantity of this sample remained, and it was therefore used preciously and judiciously, making this a unique, one-time retrospective analysis that cannot be raeproduced under identical biological or environmental conditions. To date, no such long-term stability evaluation of biomimetically synthesized CdS nanoparticles has ever been reported, establishing the novelty and scientific value of this work. A comprehensive suite of characterization techniques—including powder X-ray diffraction, UV–Vis absorption spectroscopy, photoluminescence, FTIR, SEM, FESEM, and thermogravimetric analysis—reveals that the aged CdS nanoparticles have retained their crystalline structure, biomolecular capping signatures, optical absorption features, and morphological coherence even after 15&#xa0;years of ambient storage. Comparative evaluation with archival data from the time of synthesis clearly demonstrated that the characteristic diffraction patterns and chemical signatures remained preserved, confirming the long-term retention of both structural and surface features.Photocatalytic studies demonstrate sustained high efficiency in degrading textile dyes such as Methylene Blue and Congo Red, with the 15-year-old CdS nanoparticles maintaining their chemical identity and showing excellent reusability across five cycles. These findings highlight the remarkable inherent stability and the natural endurance imparted by fungal-mediated biomimetic synthesis, enabling long-term preservation without external stabilizing agents.Overall, this work provides the first real-time evidence of time-enduring structural, optical, and functional stability in biomimetically synthesized semiconductor nanoparticles, underscoring their potential for environmental remediation, sustainable materials development, and long-term photocatalytic applications.</p>

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A unique biomimetic preservation study of fungal-capped CdS nanoparticles for sustainable photocatalysis

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Rashmi Sanghi,
  • Ramanpreet Kaur,
  • Deeksha Maurya,
  • Ajit Sharma

摘要

This study presents a rare and unprecedented investigation into the long-term photostability and physicochemical integrity of fungal-capped CdS nanoparticles preserved for more than 15 years since their original biomimetic synthesis. Only a very limited quantity of this sample remained, and it was therefore used preciously and judiciously, making this a unique, one-time retrospective analysis that cannot be raeproduced under identical biological or environmental conditions. To date, no such long-term stability evaluation of biomimetically synthesized CdS nanoparticles has ever been reported, establishing the novelty and scientific value of this work. A comprehensive suite of characterization techniques—including powder X-ray diffraction, UV–Vis absorption spectroscopy, photoluminescence, FTIR, SEM, FESEM, and thermogravimetric analysis—reveals that the aged CdS nanoparticles have retained their crystalline structure, biomolecular capping signatures, optical absorption features, and morphological coherence even after 15 years of ambient storage. Comparative evaluation with archival data from the time of synthesis clearly demonstrated that the characteristic diffraction patterns and chemical signatures remained preserved, confirming the long-term retention of both structural and surface features.Photocatalytic studies demonstrate sustained high efficiency in degrading textile dyes such as Methylene Blue and Congo Red, with the 15-year-old CdS nanoparticles maintaining their chemical identity and showing excellent reusability across five cycles. These findings highlight the remarkable inherent stability and the natural endurance imparted by fungal-mediated biomimetic synthesis, enabling long-term preservation without external stabilizing agents.Overall, this work provides the first real-time evidence of time-enduring structural, optical, and functional stability in biomimetically synthesized semiconductor nanoparticles, underscoring their potential for environmental remediation, sustainable materials development, and long-term photocatalytic applications.