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BPP-enhanced core-shell structured multilayer hyperbolic metamaterial composite as SERS substrate for ultrasensitive
Zhuofan Wei1, Xiaomu Shan1, Jian Shi1
1Collaborative Innovation Center of Light Manipulations and Applicationsin, School of Physics and Electronics , Universities of Shandong, Shandong Normal University, Jinan, 250014, China.
Mikrochimica Acta
|June 3, 2025
Summary
A novel surface-enhanced Raman scattering (SERS) substrate combines Au@ZIF-8 nanoparticles with multilayer films. This synergy enhances electromagnetic fields for ultrasensitive molecular detection, achieving remarkable sensitivity.
Area of Science:
- Materials Science
- Nanotechnology
- Spectroscopy
Background:
- Surface-enhanced Raman scattering (SERS) is a powerful technique for molecular detection.
- Existing SERS substrates face limitations in sensitivity and stability.
- Plasmonic nanostructures offer potential for enhanced electromagnetic fields.
Purpose of the Study:
- To design and fabricate a novel SERS composite substrate.
- To investigate the synergistic effects of localized surface plasmon resonance (LSPR) and bulk plasmon polariton (BPP) for enhanced electromagnetic fields.
- To achieve ultrasensitive molecular detection.
Main Methods:
- Fabrication of Au@ZIF-8 nanoparticles (NPs) with a ZIF-8 shell.
- Construction of multilayer Au/Al2O3 thin films (MLFs).
- Coupling of LSPR from Au@ZIF-8 NPs with BPP from MLFs.
- Characterization of the composite substrate using SERS.
Main Results:
- The composite substrate demonstrated significant electromagnetic field enhancement due to the synergy between LSPR and BPP.
- The ZIF-8 shell prevented NP agglomeration and concentrated probe molecules.
- Detection limits of 8.6 × 10^-12 M for rhodamine 6G and 1.5 × 10^-9 M for Crystal Violet were achieved.
- Enhanced electric field intensity increased with the number of film layers.
Conclusions:
- The designed composite SERS substrate exhibits superior performance compared to conventional substrates.
- The synergistic mechanism of SPP with LSPR is crucial for ultrasensitive detection.
- This composite substrate holds great potential for various applications in molecular detection.
