Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 44, Pages 50024-50032Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c12124
Keywords
PS sphere array; Ag nanoparticles; SERS substrate; FDTD simulation; anti-counterfeiting
Funding
- National Natural Science Foundation of China
- National Key Research and Development Program of China
- National Natural Science Foundation of Zhejiang Province
- Fundamental Research Funds for the Provincial Universities of Zhejiang
- Key Research Project of Zhejiang Lab
- [51901060]
- [12004090]
- [2019YFE0121700]
- [LY21E010004]
- [LQ21A040009]
- [GK209907299001 - 025]
- [GK219909299001-003]
- [2022MG0AB02]
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By designing different growth patterns of silver nanoparticles, tunable localized surface plasmon resonance (LSPR) can be achieved in annealed sandwich nanocavity structures. This leads to enhanced electromagnetic fields and surface-enhanced Raman spectroscopy (SERS) signals. The developed nanostructures can be effectively used as stable, nonreproducible, and markable anti-counterfeiting signs.
Based on etched PS sphere arrays, the different growths of Ag nanoparticles with tunable LSPR are designed when SiO2-25 nm/Ag-30 nm/SiO2-100 nm sandwich nanocavity structures are annealed at 500 & DEG;C, including the hexagonal silver nanoparticle rings, circular silver nanoparticle rings, and aggregated silver nanoparticles. The uniformity of particle size and regularity of position generate enhanced electromagnetic field and good surface-enhanced Raman spectroscopy signals as confirmed by UV-vis observation and finite difference time domain method simulation. The developed nanostructures are effectively used as stable, nonreproducible, and markable anti-counterfeiting signs.
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