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Related Experiment Video

Updated: Aug 9, 2025

Author Spotlight: Development and Application of SERS Flexible Substrates Using Synthesized AgNPs
03:33

Author Spotlight: Development and Application of SERS Flexible Substrates Using Synthesized AgNPs

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3D flexible compositing resonant cavity system for high-performance SERS sensing.

Weihao Liu, Yaru Li, Zhen Li

    Optics Express
    |February 24, 2023
    PubMed
    Summary

    This study introduces a flexible resonant cavity sensor for highly sensitive surface-enhanced Raman spectroscopy (SERS) detection. The novel sensor demonstrates excellent performance for detecting trace analytes, showing great potential for food safety applications.

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    Area of Science:

    • Plasmonics and Nanophotonics
    • Spectroscopy
    • Materials Science

    Background:

    • Arrayed resonant cavities are crucial for enhancing optical trapping in surface-enhanced Raman spectroscopy (SERS).
    • Developing flexible and highly sensitive SERS sensors is essential for real-world applications.

    Purpose of the Study:

    • To theoretically and experimentally investigate a novel 3D composite flexible resonant cavity system for SERS.
    • To evaluate the sensor's performance in detecting trace amounts of analytes and its suitability for in-situ measurements.

    Main Methods:

    • Fabrication of a three-dimensional (3D) composite AgNPs-Al2O3/Au/inverted patterned sapphire substrate PMMA (IPSSPMMA) flexible resonant cavity.
    • Utilizing Finite Element Method (FEM) to model plasma coupling (localized surface plasmons and surface plasmon polaritons) for resonant cavity creation.
    • Employing Rhodamine 6G (R6G) and Crystalline Violet (CV) as probe molecules to assess sensor performance.

    Main Results:

    • Achieved ultra-low limits of detection (LOD) for R6G (6.01 × 10⁻¹² M) and CV (5.36 × 10⁻¹⁰ M).
    • Obtained high enhancement factors (EF) for R6G up to 8.6 × 10⁹.
    • Demonstrated successful in-situ detection of CV on aquatic products with an LOD of 3.96 × 10⁻⁵ M.

    Conclusions:

    • The proposed flexible compositing resonant cavity system exhibits ultra-sensitivity, stability, uniformity, and reproducibility.
    • The sensor shows significant potential for highly sensitive in-situ detection of surface analytes, particularly in the field of food safety.