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Barrier films preventing permeation of gases and moistures are important formany industries ranging from food to medical and from chemical to electronic.From this perspective, graphene has recently attracted particular interestbecause its defect free monolayers are impermeable to all gases and liquids.However, it has proved challenging to develop large-area defectless graphenefilms suitable for industrial use. Here we report barrier properties ofmultilayer graphitic films made by chemical reduction of easily and cheaplyproduced graphene oxide laminates. They are found to provide a practicallyperfect barrier that blocks all gases, liquids and aggressive chemicalsincluding, for example, hydrofluoric acid. In particular, if graphene oxidelaminates are reduced in hydroiodic acid, no permeation of hydrogen and watercould be detected for films as thin as 30 nm, which remain opticallytransparent. The films thicker than 100 nm become completely impermeable. Theexceptional barrier properties are attributed to a high degree ofgraphitization of the laminates and little structural damage during reduction.This work indicates a close prospect of thin protective coatings with stabilityand inertness similar to that of graphene and bulk graphite, which can beinteresting for numerous applications.

Impermeable Barrier Films and Protective Coatings Based on Reduced Graphene Oxide