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<p>Uniform, reproducible and stable SERS substrates with high detection sensitivity are crucial for their successful commercial applications. Here, we introduce a plasmonic SERS substrate based on gold nanoparticles (AuNPs) fabricated by using a straightforward light-driven in-situ method for highly sensitive molecular detection. A dense array of zinc oxide nanorods (ZnO NRs) was used as a support surface for the in-situ growth of Au nanoparticles (AuNPs). The SERS performance of the fabricated Au-ZnO substrates was evaluated by using rhodamine 6G (R6G) dye as a model Raman probe, where the distribution of the AuNPs on the substrate was found to play an important role defining the SERS activities The Au-ZnO substrates exhibited exceptional homogeneity (RSD = 3.95%), a detection limit (LOD) of 9 × 10<sup>–11</sup>&#xa0;M, and signal enhancement in the order of 10<sup>6</sup>. Additionally, these substrates demonstrated good stability over a period of 4&#xa0;weeks when stored under standard room conditions, maintaining more than 80% of the initial Raman signal intensity. When tested for antibiotic residue detection in water using amoxicillin as a model antibiotic, the Au-ZnO substrates revealed LOD in the order of 10<sup>–9</sup>&#xa0;M with linear detection over a wide concentration range of amoxicillin in water. The present work offers a straightforward and inexpensive solution-processed fabrication approach for SERS substrates that holds great potential for the development of extremely sensitive and reliable SERS-based detection and sensor systems.</p> Graphical abstract <p></p>

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Light-driven in situ deposited Au nanoparticles on ZnO substrate with ultrasensitive SERS enhancement for molecular detection

  • 期刊论文

  • 发表日期：

    2025年4月6日

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  • Apichaya Chantaraklud,
  • Chanoknan Rattanabut,
  • Suwussa Bamrungsap,
  • Tanujjal Bora

摘要

Uniform, reproducible and stable SERS substrates with high detection sensitivity are crucial for their successful commercial applications. Here, we introduce a plasmonic SERS substrate based on gold nanoparticles (AuNPs) fabricated by using a straightforward light-driven in-situ method for highly sensitive molecular detection. A dense array of zinc oxide nanorods (ZnO NRs) was used as a support surface for the in-situ growth of Au nanoparticles (AuNPs). The SERS performance of the fabricated Au-ZnO substrates was evaluated by using rhodamine 6G (R6G) dye as a model Raman probe, where the distribution of the AuNPs on the substrate was found to play an important role defining the SERS activities The Au-ZnO substrates exhibited exceptional homogeneity (RSD = 3.95%), a detection limit (LOD) of 9 × 10–11 M, and signal enhancement in the order of 106. Additionally, these substrates demonstrated good stability over a period of 4 weeks when stored under standard room conditions, maintaining more than 80% of the initial Raman signal intensity. When tested for antibiotic residue detection in water using amoxicillin as a model antibiotic, the Au-ZnO substrates revealed LOD in the order of 10–9 M with linear detection over a wide concentration range of amoxicillin in water. The present work offers a straightforward and inexpensive solution-processed fabrication approach for SERS substrates that holds great potential for the development of extremely sensitive and reliable SERS-based detection and sensor systems.

Graphical abstract