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(A) Chemical structure of branched PEI and PVDMA used for the covalent layer-by-layer assembly of multilayer films. (B) Schematic showing the steps in film fabrication. Chemical functional groups: decylamine (denoted R1 or DA) was used to functionalize the first two bilayers, and dimethylaminopropylamine (denoted R2 or DM) was used to functionalize the outer 2.5 bilayers (see text).
