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Binary "island" shaped arrays with high-density hot spots for surface-enhanced Raman scattering substrates
Weidong Zhao1, Shuyuan Xiao2, Yuxian Zhang1
1Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China. yangz@ustb.edu.cn.
Nanoscale
|July 17, 2018
Summary
We developed a new, low-cost method to create highly sensitive surface-enhanced Raman scattering (SERS) substrates using gold nanoparticles on silica spheres. These substrates offer reproducible, high-density hot spots for enhanced molecular detection and photocatalysis monitoring.
Area of Science:
- Nanotechnology
- Materials Science
- Spectroscopy
Background:
- Surface-enhanced Raman scattering (SERS) requires substrates with high-density hot spots for sensitive molecular detection.
- Existing SERS substrates often face challenges in reproducibility and cost-effectiveness.
Purpose of the Study:
- To develop a facile and low-cost fabrication method for reproducible SERS substrates with high-density hot spots.
- To explore the potential of these substrates for monitoring photocatalytic reactions.
Main Methods:
- Fabrication of binary "island" shaped arrays (BISA) by depositing gold nanoparticle (AuNP) films onto 2D silica microsphere opal structures.
- Characterization of SERS performance by varying silica sphere size.
- Finite-difference time-domain (FDTD) simulations to analyze electromagnetic field distribution.
- Investigation of photocatalytic activity using the dimerization of 4-aminothiophenol (4-ATP) to 4,4'-dimercaptoazobenzene (DMAB).
Main Results:
- Achieved an enhancement factor (EF) of 3.74 × 1010 and signal intensity deviation below 8% with 770 nm silica sphere arrays.
- BISA substrates accommodate more AuNPs and exhibit enhanced hot spot intensity compared to planar substrates.
- FDTD simulations confirmed strong periodic electric fields at hot spots.
- Demonstrated tunable photocatalytic activity by altering silica sphere size, with SERS monitoring the reaction process.
Conclusions:
- The developed BISA fabrication method offers a promising route for highly sensitive and reproducible SERS platforms.
- These substrates are suitable for sensitive molecule detection and can be integrated with photocatalysis for reaction monitoring.
- The ability to tune photocatalytic activity by substrate design opens new avenues for catalyst development.
