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(a) Brightfield image of micropads aggregating the core-shell magnetic nanoparticles and SERS mapping of the micropads under 10× magnification (scar bar: 50 μm); (b) SEM image of a micropad with magnetically trapped gold coated iron/silica nanoparticles; and (c) comparison of SERS signals of the MBA-functionalized nanoparticle collected from the magnetic micropad area, gap area between pads, and stock solution.
