Magnetic Fe₃O₄@SiO₂@Ag@COOH NPs/Au Film with Hybrid Localized Surface Plasmon/Surface Plasmon Polariton Modes for Surface-Enhanced Raman Scattering Detection of Thiabendazole.

A magnetic Fe₃O₄@SiO₂@Ag@COOH nanoparticle (NPs)/Au film was fabricated as an effective surface-enhanced Raman scattering (SERS) substrate through a combination of a solvothermal reaction, the Stöber method and an reaction. The superparamagnetic property of Fe₃O₄@SiO₂@Ag and the decoration with -COOH groups allow efficient enrichment and capture of thiabendazole molecules. A large quantity of sub-10 nm gaps emerge when Ag NPs are decorated on the surface of the SiO₂ shell, offering a dramatic electromagnetic field enhancement induced by localized surface plasmon resonance (LSPR).

Template growth of Au/Ag nanocomposites on phosphorene for sensitive SERS detection of pesticides.

We report template growth and dense packing of noble metallic nanoparticles (NPs) on few-layer phosphorene for sensitive surface-enhanced Raman scattering (SERS) detection. Phosphorene obtained by electrochemical exfoliation serves as both the template and reductant in the fabrication of noble metallic NPs which are dispersed on phosphorene without aggregation or pile-up. The BP/Ag/Au and BP/Au/Ag nanocomposites with a nanogap structure exhibit excellent SERS sensitivity and reproducibility with respect to Rhodamine 6G.