Self-assembled Au nanoparticle arrays on thiol-functionalized resin beads for sensitive detection of paraquat by surface-enhanced Raman scattering

- Creation of thousands of plasmonic Au NPs-resin core-shell spheres per gram.
- Scalable fabrication under mild conditions without using any expensive equipment.
- Each as-synthesized Au NPs-resin sphere could be an easy-to-use SERS substrate.
- Higher reproducible enhancement effect enabled by densely well-ordered Au NPs.
- Qualitative detection of pesticide paraquat with a low detection limit of 10−12 M.