Layer-by-layer assembly of titanate nanosheets/poly- (ethylenimine) on PEN films

Alternating layers of TiO2 nanosheets and poly(ethylenimine) were sequentially dip coated onto a polyethylene naphthalate substrate (PEN) using layer-by-layer assembly. UV–vis spectroscopy shows a linear growth of the PEI/nanosheets bilayer on the PEN substrate. The cross-section microstructure of the LBL film was studied using scanning electron microscopy (SEM). Helium permeability measurement showed that the titania nanosheet/PEI bilayers reduced the permeation rate of He through the coated PEN film.

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► In this study we examine the formation of TiO2 nanosheet/PEI layer by layer assembly on PEN.
► UV–vis spectroscopy shows a linear growth of the PEI/nanosheets bilayer on the PEN substrate.
► We report significantly reduced helium transmission through the LBL films.