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Fig. 3. (a) Optical microscopy image of Co-AOIA; (b) FESEM image of Co-AOIA; (c) FESEM image of Co@NPC; (d) TEM image of cobalt nanoparticles in Co@NPC; (e) HRTEM image of a single cobalt nanoparticle showing lattice fringes; (f) spot ring SAED pattern of cobalt nanoparticle in Co@NPC.