English: Twenty layers of PEM on a gold substrate measured by Multi-Parametric Surface Plasmon Resonance in real-time. Adsorption kinetics of PSS (poly(sodium 4-styrenesulfonate)) and PAH (poly(allylamine hydrochloride)) layers can be seen. Thickness of each layer is 2.5 nm. To ensure uniform charge, the gold surface of sensor was primed with PEI (poly(ethyleneimine)).
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