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(a–c) TEM images of unmodified SNs (a), PDA encapsulated SNs (b), and GO and PDA encapsulated SNs (c); (d–f) SEM images of the single resultant SCP (d), surface microstructure of the resultant SCP (e), and interior microstructure of the resultant SCP. The scale bars are 100 nm in (a)–(c), 100 μm in (d), 1 μm in (e), and 2 μm in (f).
