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SEM, TEM, DLS and elemental analysis of corresponding nanoparticles. (A) PDA, (B) PDA@dSiO2, (C) PDA@dSiO2@mSiO2, (D) PDA@hm. Average sizes of PDA, PDA@dSiO2, PDA@dSiO2@mSiO2 and PDA@hm were 151.73 nm, 205.69 nm, 235.24 nm and 234.77 nm, respectively. (E) Corresponding elemental (Si, O, C) mappings of PDA@hm.
