Fig. 4From: Material priority engineered metal-polyphenol networks: mechanism and platform for multifunctionalitiesa Coating thickness of the PC-MPNI and PC-MPNII coatings before and after treatment with Fe(NO3)3 for 30Â min. AFM images of b PC-MPNI and c PC-MPNII coatings before and after treatment with Fe(NO3)3 for 30Â min. b1, c1 and b2, c2 are images taken before and after treatment, respectively. d Surface roughness of the PC-MPNI and PC-MPNII coatings before and after treatment with Fe(NO3)3 for 30Â minBack to article page