Fig.5-12 Gas barrier experiment by using real-time synchrotron radiation X-ray photoelectron spectroscopy (SR-XPS) combined with supersonic molecular beams and experimental evidence of O2 permeation through graphene
(a) Conceptual diagram of SR-XPS measurements for irradiating graphene on a Cu substrate with oxygen beams. (b) X-ray photoelectron spectral change after irradiation with O2 beams with the translational energy of 1.22 eV. The increase in the O-Cu component (purple) is evidence that O2 penetrates graphene and oxidizes the Cu surface.
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