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Ultra-thin flexible nano-composite barrier layer consists of graphene oxide and polyelectrolyte was prepared using the layer-by-layer processing method. Microstructures of the barrier layer was optimized via modifying coating conditions and inducing chemical reactions. Although the barrier layer consists of hydrophilic polyelectrolyte was not effective in blocking the water vapor permeation, the chemical reduction of graphene oxide as well as conversion of polyelectrolyte to hydrophobic nature were very effective in reducing the permeation.

Ultra-thin flexible encapsulation layer consists of graphene oxide/polymeric multilayer were prepared using layer-by-layer processing method. The encapsulation layer on a PET substrate reduced the substrate WVTR by more than five orders of magnitude.

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