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Plasmonic sensing using trapped silver-coated magnetic nanoparticles. (a) Cross-sectional schematic showing the chemical functionalization of magnetic beads with 4-mercaptopyridine (4-MP) after coating them with Ag nanoparticles. (b) Raman signal obtained from the beads captured on metallic wedges as compared to 10 nm of Al2O3-coated metallic wedges and standard glass slide.
