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Updated: Jan 30, 2026

Author Spotlight: Development and Application of SERS Flexible Substrates Using Synthesized AgNPs
Published on: November 17, 2023
Phase controlled SERS enhancement
Yuanhui Zheng1,2,3, Lorenzo Rosa4,5, Thibaut Thai6,7
1State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, China. Yuanhui.Zheng@fzu.edu.cn.
Researchers developed high-sensitivity Surface-Enhanced Raman Spectroscopy (SERS) substrates using core-satellite nanostructures on silica-coated silicon. Optimizing silica thickness enhances SERS signals by controlling light interference for improved chemical and biochemical sensing.
Area of Science:
- Nanotechnology
- Spectroscopy
- Materials Science
Background:
- Surface-enhanced Raman spectroscopy (SERS) is crucial for chemical and biochemical sensing.
- Optical interference substrates enhance SERS, but the origin of this effect requires systematic study.
Purpose of the Study:
- To develop high-sensitivity SERS substrates using self-assembled core-satellite nanostructures and silica-coated silicon interference layers.
- To investigate the origin of SERS enhancement related to substrate design.
Main Methods:
- Fabrication of core-satellite nanostructures on silica-coated silicon interference layers.
- Systematic variation of silica spacer thickness.
- Finite difference time domain (FDTD) modeling to analyze optical field enhancement.
Main Results:
- SERS enhancement is dependent on the silica spacer thickness on a silicon substrate.
- FDTD modeling reveals enhancement arises from constructive interference of light reflected at interfaces.
- Optimized substrates with a 135 nm silica layer showed ~13 times higher SERS activity than glass substrates.
Conclusions:
- The study elucidates the mechanism of SERS enhancement using optical interference substrates.
- Spacer thickness is a critical parameter for maximizing local-field enhancement in SERS nanogaps.
- Developed substrates offer a pathway for highly sensitive chemical and biochemical detection.
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