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(a–c) SCPs derived from the designed multi-layer PDA and GO encapsulated SNs with red (a), green (b), and blue (c) structural colors; (d–f) SCPs derived from the unmodified SNs with red (d), green (e), and blue (f) structural colors. The scale bars are 200 μm in (a)–(b) and (d)–(e), and 300 μm in (c) and (f). (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
