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A) Infrared spectrum acquired for a freestanding PEI/PVDMA film. Fluorescence micrographs of B) a freestanding film treated with dansyl cadaverine, C) an untreated free-standing film, and D) a freestanding film treated first with propylamine followed by dansyl cadaverine. Dotted lines show the edges of the films. Scale bars = 500 µm.
