Designed Growth of AgNP Arrays for Anti-counterfeiting Based on Surface-Enhanced Raman Spectroscopy Signals

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.

Automated summary

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.