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<p>The increasing environmental and health concerns associated with trace-level pollutants have intensified the need for simple, stable, and ultra-sensitive detection platforms capable of identifying and quantifying hazardous species even at their tiniest concentrations. In this work, we present laser-scribed AuAg@AgCu nanourchins on silicon substrates (Si) as efficient and stable surface-enhanced Raman scattering (SERS) platforms. These platforms are suitable for multiple Raman laser excitation lines (532 and 780&#xa0;nm) by incorporating laser-ablated AuAg bimetallic nanoparticles and can be used for the ultrasensitive detection of arsenolite (As<sub>2</sub>O<sub>3</sub>) and polystyrene microplastics. The laser-fabricated architecture provides dense, hierarchical 3D plasmonic “hotspots” with strong electromagnetic coupling and a dual synergistic effect between the Au-Ag and Ag-Cu nanostructure domains, yielding broadband excitation compatibility. The sensor can identify trace levels of R6G down to 5 × 10<sup>–14</sup> M, arsenolite down to 10<sup>–13</sup> M (532&#xa0;nm), and polystyrene microplastics at concentrations as low as 2 × 10<sup>− 3</sup> g/L. The sensor demonstrates a record detection limit for arsenic oxide, surpassing the sensitivity of other SERS-based sensing results reported. The substrate demonstrates excellent signal reproducibility (RSD = 8.7%) and strong long-term stability of up to five weeks. These results highlight the potential of laser-engineered bimetallic plasmonic surfaces as robust, scalable, and highly sensitive SERS platforms for monitoring environmental pollutants.</p>

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Dual-Alloyed AuAg@AgCu Nanourchins as Surface-Enhanced Raman Scattering Platforms for Trace Level Detection of Arsenolite and Microplastic

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Jithin Kundalam Kadavath,
  • Bindu Krishnan,
  • Rene Fabian Cienfuegos Pelaes,
  • Selene Sepúlveda Guzman,
  • Nora Aleyda Garcia Gomez,
  • David Avellaneda Avellaneda,
  • Sadasivan Shaji

摘要

The increasing environmental and health concerns associated with trace-level pollutants have intensified the need for simple, stable, and ultra-sensitive detection platforms capable of identifying and quantifying hazardous species even at their tiniest concentrations. In this work, we present laser-scribed AuAg@AgCu nanourchins on silicon substrates (Si) as efficient and stable surface-enhanced Raman scattering (SERS) platforms. These platforms are suitable for multiple Raman laser excitation lines (532 and 780 nm) by incorporating laser-ablated AuAg bimetallic nanoparticles and can be used for the ultrasensitive detection of arsenolite (As2O3) and polystyrene microplastics. The laser-fabricated architecture provides dense, hierarchical 3D plasmonic “hotspots” with strong electromagnetic coupling and a dual synergistic effect between the Au-Ag and Ag-Cu nanostructure domains, yielding broadband excitation compatibility. The sensor can identify trace levels of R6G down to 5 × 10–14 M, arsenolite down to 10–13 M (532 nm), and polystyrene microplastics at concentrations as low as 2 × 10− 3 g/L. The sensor demonstrates a record detection limit for arsenic oxide, surpassing the sensitivity of other SERS-based sensing results reported. The substrate demonstrates excellent signal reproducibility (RSD = 8.7%) and strong long-term stability of up to five weeks. These results highlight the potential of laser-engineered bimetallic plasmonic surfaces as robust, scalable, and highly sensitive SERS platforms for monitoring environmental pollutants.