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(a) Scanning electron micrograph (SEM) of the silver nanosystem with silica core diameter of 180 nm, and (b) corresponding coated 180-nm UV-vis spectrograph; (c) a batch of sparsely coated 180-nm nanoparticles, and (d) corresponding UV-vis spectrograph; (e) a silver-coated 520-nm silica core batch, and (f) corresponding UV-vis spectrograph. All scale bars are 200 nm.
