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<p>Surface-enhanced Raman scattering (SERS) is a powerful analytical method that employs nanostructured substrates to capture molecular fingerprints and holds significant importance in food analysis. Despite its potential, enhancing the sensitivity and expanding the practical application of SERS substrates continue to present major challenges. In this study, a SERS substrate based on uniform silver nanoparticles/ZnO nanorod arrays (Ag/ZnO NRs) was fabricated by combining hydrothermal synthesis with magnetron sputtering. Subsequently, centrifuged Ag nanoparticles (Ag NPs) were dispersed onto the substrate surface using a drop-casting method. It was observed that the density of hot spots increased with the addition of centrifuged Ag NPs onto the Ag/ZnO NRs substrate. The combination of the localized surface plasmon resonance of the Ag NPs with the charge transfer properties of the Ag/ZnO structure resulted in the development of a highly sensitive SERS substrate. This substrate was capable of detecting Fast Green dye at a low concentration of 2.5 × 10<sup>−4</sup>&#xa0;ppm, achieving an enhancement factor (EF) of 1.5 × 10<sup>7</sup> and good detection uniformity (relative standard deviation, RSD = 7.5%). The rapid identification and detection of Fast Green are critically important for public health and food safety.</p>

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Enhancing the Sensitivity of Ag/ZnO NRs SERS Substrates to Fast Green Dyes by the Assistance of Centrifuged Ag Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Nguyen Huu Ke,
  • Nguyen Hoang Long,
  • Dao Anh Tuan

摘要

Surface-enhanced Raman scattering (SERS) is a powerful analytical method that employs nanostructured substrates to capture molecular fingerprints and holds significant importance in food analysis. Despite its potential, enhancing the sensitivity and expanding the practical application of SERS substrates continue to present major challenges. In this study, a SERS substrate based on uniform silver nanoparticles/ZnO nanorod arrays (Ag/ZnO NRs) was fabricated by combining hydrothermal synthesis with magnetron sputtering. Subsequently, centrifuged Ag nanoparticles (Ag NPs) were dispersed onto the substrate surface using a drop-casting method. It was observed that the density of hot spots increased with the addition of centrifuged Ag NPs onto the Ag/ZnO NRs substrate. The combination of the localized surface plasmon resonance of the Ag NPs with the charge transfer properties of the Ag/ZnO structure resulted in the development of a highly sensitive SERS substrate. This substrate was capable of detecting Fast Green dye at a low concentration of 2.5 × 10−4 ppm, achieving an enhancement factor (EF) of 1.5 × 107 and good detection uniformity (relative standard deviation, RSD = 7.5%). The rapid identification and detection of Fast Green are critically important for public health and food safety.