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a) Triblock copolymer nanoparticle without metal salt incubation and no iodine staining showing the absence of contrast in the TEM image. b) HAuCl4 loaded onion-like PS-b-P2VP-b-PS triblock copolymer particle showing the stained P2VP phase by the gold salt (no iodine staining). c) Gold nanoparticle loaded PS-b-P2VP-b-PS triblock copolymer particles with onion-like morphology after the absorption and reduction of HAuCl4, insert; high resolution TEM showing sub 10 nm gold nanoparticles.
