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TEM images of silica particles with varying size: (A) 118 ± 5 nm; (B) 74 ± 3 nm; (C) 38 ± 1 nm with 5.0 ± 0.8 nm diameter iron oxide core; (D) 28 ± 1 nm—coated with Au nanoshells. Each frame shows the nanoshells at different stages of the deposition process: (i) bare silica; (ii) Au nanocrystal-decorated silica; (iii) partial Au shell growth; (iv) complete Au shell formation.
