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Growth profiles of pH-controllable polypeptide multilayer nanofilms a) on quartz slides and examined using UV-vis spectrometry, and b) on stainless steel discs and examined using ellipsometry. The inset in b) presents the atomic force microscope images of multilayer films formed at pHs 4.0, 7.0, and 10.0. The scale bars are 200 nm.
