The smallest gas permeability 0.094 m/Pa s was obtained with 16 wt% GOcontents, which decreased by 99.85% compare with pure cellu-losic paper (64.3 m/Pa · s). and this number is lower than thepaper (0.29 m/Pa s) surface-sized with 12.58 g/m2alkyl ketenedimer/nanocrystalline cellulose emulsion (Yang et al., 2016).The obviously reduced air permeability was probably due to