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<p>Plasmonic nanoparticle-embedded semiconductor nanostructures offer significant potential in catalysis and sensing applications. In this study, we fabricated highly hierarchical silicon nanowires (SiNWs) via metal-assisted chemical etching, followed by electroless silver deposition to obtain Ag-functionalized silicon nanowires (Ag@SiNW). As-formed nanowires exhibited well-organized, vertically grown nanowires with an average diameter of ~ 49&#xa0;nm. Post-deposition analysis confirmed the effective coverage of silver nanoarrays both on top and side walls of nanowires. The photocatalytic performance of Ag@SiNW has been systematically investigated as a function of silver deposition duration. It was observed that the photocatalytic efficiency initially increased with decreasing immersion time, reaching a maximum at 5&#xa0;s and then declined with shorter durations. The maximum degradation efficiency of 99% for methylene blue was achieved after 140&#xa0;min of light exposure under optimal conditions. Additionally, Ag@SiNW was evaluated as SERS-based chemosensors for tracking methylene blue. The SERS enhancement was found to be tunable by adjusting the silver deposition time, with the highest enhancement observed at 10&#xa0;s. Ag@SiNW sensors were explored to track the photocatalytic degradation pathway of methylene blue using SERS. The kinetic coefficient of 0.0131 was determined, comparable to values obtained from UV-visible methods. Overall, Ag@SiNW substrates demonstrated versatile functionality in both photocatalysis and optical sensing, highlighting their potential in environmental remediation applications.</p>

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Dual Performance of Silver Nanoarrays Functionalized Silicon Nanowires for Highly Effective SERS Sensing and Photocatalytic Reduction of Organic Pollutants

  • 期刊论文

  • 发表日期：

    2025年8月10日

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  • Anakha Udayan,
  • Soumya Columbus,
  • Krithikadevi Ramachandran,
  • Mounir Gaidi,
  • Kais Daoudi

摘要

Plasmonic nanoparticle-embedded semiconductor nanostructures offer significant potential in catalysis and sensing applications. In this study, we fabricated highly hierarchical silicon nanowires (SiNWs) via metal-assisted chemical etching, followed by electroless silver deposition to obtain Ag-functionalized silicon nanowires (Ag@SiNW). As-formed nanowires exhibited well-organized, vertically grown nanowires with an average diameter of ~ 49 nm. Post-deposition analysis confirmed the effective coverage of silver nanoarrays both on top and side walls of nanowires. The photocatalytic performance of Ag@SiNW has been systematically investigated as a function of silver deposition duration. It was observed that the photocatalytic efficiency initially increased with decreasing immersion time, reaching a maximum at 5 s and then declined with shorter durations. The maximum degradation efficiency of 99% for methylene blue was achieved after 140 min of light exposure under optimal conditions. Additionally, Ag@SiNW was evaluated as SERS-based chemosensors for tracking methylene blue. The SERS enhancement was found to be tunable by adjusting the silver deposition time, with the highest enhancement observed at 10 s. Ag@SiNW sensors were explored to track the photocatalytic degradation pathway of methylene blue using SERS. The kinetic coefficient of 0.0131 was determined, comparable to values obtained from UV-visible methods. Overall, Ag@SiNW substrates demonstrated versatile functionality in both photocatalysis and optical sensing, highlighting their potential in environmental remediation applications.