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Hybrid Printing for the Fabrication of Smart Sensors
Published on: January 31, 2019
Fabrication optimization and application of 3D hybrid SERS substrates
Xiaoyuan Geng1,2, Chen Wu1,2, Siying Liu1,2,3
1CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences Fuzhou 350002 P. R. China songliang@fjirsm.ac.cn zhangy@fjirsm.ac.cn.
Researchers developed 3D hybrid surface-enhanced Raman scattering (SERS) substrates using gold nanoparticles. The optimized sandwich structure demonstrated superior SERS activity and high sensitivity for molecule detection, showing great potential for practical analysis.
Area of Science:
- Plasmonics and Nanomaterials Science
- Surface-Enhanced Raman Scattering (SERS)
- Nanoparticle Engineering
Background:
- Three-dimensional (3D) plasmonic nanostructures offer unique advantages for SERS due to tunable plasmonic coupling.
- Investigating the spatial arrangement of nanoparticles is crucial for optimizing SERS substrate performance.
- Developing highly sensitive and reproducible SERS substrates is essential for advanced analytical applications.
Purpose of the Study:
- To construct and evaluate 3D hybrid SERS substrates using gold nanospheres (AuNS) and gold nanooctahedra (AuNO).
- To explore the impact of nanoparticle arrangement and size on SERS activity and hot spot generation.
- To achieve high SERS performance and sensitivity for practical molecular detection.
Main Methods:
- Fabrication of two-dimensional (2D) planar substrates using air-liquid interface-assisted self-assembly.
- Layer-by-layer construction of 3D hybrid SERS substrates with varying nanoparticle combinations.
- Characterization of SERS performance, reproducibility, and sensitivity using model molecules (thiram).
Main Results:
- The optimized AuNS/AuNO/AuNS sandwich structure exhibited the strongest SERS enhancement, outperforming homogeneous substrates.
- The optimized 3D substrate showed excellent reproducibility with a relative standard deviation (RSD) of 1.08%.
- Detection of thiram molecules demonstrated a good linear relationship (R² of 0.991) and a low detection limit (100 ppb).
Conclusions:
- 3D hybrid plasmonic nanostructures provide a powerful platform for enhancing SERS sensitivity.
- The spatial arrangement of different gold nanoparticles significantly influences SERS activity.
- The developed 3D hybrid SERS substrates show considerable promise for sensitive and reliable chemical analysis.
