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TEM images ((a): bare AuNP, (b): AuNP@30PDOP, (c): AuNP@60PDOP, and (d): AuNP@180PDOP) of AuNP and AuNP@PDOP for different polydopamine (PDOP) deposition times (numbers indicate deposition times in min). AuNP@PDOP: PDOP-coated gold nanoparticles immersed into silver nitrate solution for different reduction times (10 mM AgNO3, 30, 60, and 180 min).
