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A HAADF-STEM (Z contrast) image of the uncoated 50Ag/Fe2O3 sample (a) and TEM images of the SiO2-coated 10Ag/Fe2O3 (b) and the SiO2-coated 35Ag/Fe2O3 sample (c). Above the images, a schematic drawing of the uncoated and SiO2-coated particles is presented, for which the red, gray and blue colors correspond to iron oxide, silver and silica particles, respectively.
