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For using successful (ultra)thin dendritic macromolecule films in (bio)sensing and microfluidic devices and for obtaining reproducible film properties, alteration effects arising from precoatings have to be avoided. Here, oligosaccharide‐modified hyperbranched poly(ethylene imine)s (PEI‐OS) were used to fabricate very thin PEI‐OS films (15–20 nm in dry state), cross‐linked with citric acid under condensation,...
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