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<p>The immobilization of stable and long-range ordered metal nanostructures on flexible materials is crucial for achieving highly active hotspots for efficient surface-enhanced Raman spectroscopy (SERS) sensing. Herein, we explored in situ detection of orthophenyl phenol on fruit surfaces using highly flexible polymer-based SERS sensors. Using pulsed laser deposition (PLD) technique, we fabricated highly ordered gold nanoarrays (Au) on polytetrafluoroethylene (PTFE) films. The morphology of the resulting Au arrays was regulated by varying the number of laser pulses (N<sub>LP</sub>). SERS activities of Au@PTFE sensors were strongly affected by the structural properties of Au arrays, as the hotspot density and interparticle distance critically influence the plasmonic enhancement. Our results indicated that Au@PTFE sensors exhibited the highest SERS enhancement at 5000 N<sub>LP.</sub> Meanwhile, studies demonstrate that Au arrays deposited on low surface energy polymers like PTFE perform better than high surface energy polymers such as Polycarbonate or Kapton. Reproducibility assessment indicated excellent spot-to-spot consistency with relative standard deviation of 12%, while the sensors retained the functionality over five consecutive cycles. Finally, the efficacy of detecting fungicides like ortho-phenyl phenols (OPP) has been investigated, which revealed pico-molar detection limits. The real-time SERS detection of OPP spiked on apples at micro, nano and picomolar levels was carried out with the estimated recovery of 117%, 95% and 105%, respectively. The current study highlights the great potential of Au@PTFE sensors for food adulterant detection with high sensitivity, repeatability, and reusability.</p>

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Pulsed Laser Deposited Gold Nanoarrays on Polytetrafluoroethylene as Efficient Plasmonic Sensors for Food Fungicide Detection

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Mounir Gaidi,
  • Kais Daoudi,
  • Soumya Columbus,
  • Krithikadevi Ramachandran,
  • My Ali El Khakani

摘要

The immobilization of stable and long-range ordered metal nanostructures on flexible materials is crucial for achieving highly active hotspots for efficient surface-enhanced Raman spectroscopy (SERS) sensing. Herein, we explored in situ detection of orthophenyl phenol on fruit surfaces using highly flexible polymer-based SERS sensors. Using pulsed laser deposition (PLD) technique, we fabricated highly ordered gold nanoarrays (Au) on polytetrafluoroethylene (PTFE) films. The morphology of the resulting Au arrays was regulated by varying the number of laser pulses (NLP). SERS activities of Au@PTFE sensors were strongly affected by the structural properties of Au arrays, as the hotspot density and interparticle distance critically influence the plasmonic enhancement. Our results indicated that Au@PTFE sensors exhibited the highest SERS enhancement at 5000 NLP. Meanwhile, studies demonstrate that Au arrays deposited on low surface energy polymers like PTFE perform better than high surface energy polymers such as Polycarbonate or Kapton. Reproducibility assessment indicated excellent spot-to-spot consistency with relative standard deviation of 12%, while the sensors retained the functionality over five consecutive cycles. Finally, the efficacy of detecting fungicides like ortho-phenyl phenols (OPP) has been investigated, which revealed pico-molar detection limits. The real-time SERS detection of OPP spiked on apples at micro, nano and picomolar levels was carried out with the estimated recovery of 117%, 95% and 105%, respectively. The current study highlights the great potential of Au@PTFE sensors for food adulterant detection with high sensitivity, repeatability, and reusability.