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(A) SEM images of freshly prepared core–shell plasmonic nanopopcorn. (B) EDX mapping shows the presence of Fe and Au in a core–shell nanoparticle. (C) Absorption spectra of core–shell nanoparticle, methylene blue, and methylene blue conjugated nanoplatform. The strong long wavelength band in the near IR region (λmax = 740 nm) for the nanoplatform is due to the oscillation of the conduction band electrons of gold.
