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. Author manuscript; available in PMC: 2012 Jan 4.
Published in final edited form as: Adv Mater. 2008 May 5;20(9):1619–1623. doi: 10.1002/adma.200702378

Figure 4.

Figure 4

Catechol-mediated silver nanoparticle formation in LbL films of PEI-C/HA-C and antibacterial activity of the nanocomposite films. A) Schematic illustration of Ag nanoparticle formation in LbL film via catechol oxidation in the presence of Ag(I). B)–D) Topographic AFM images of the LbL film after PEI-C/HA-C (n = 20) deposition (B), and the same film incubated in 1 mM AgNO3 solution for 30 min (C) and 18 h (D). E. XPS spectra of the silver incorporated LbL film shown in D (18 h). Metallic silver photoelectron (3d5/2) was detected at the binding energy of 368.4 eV. F) Live-dead assay of adhered E. coli on bare Si, LbL (n = 20), and LbL+Ag (n = 20, 18 h) surfaces.