biostudies-literatureUnknown5Ye SCombined high strength and toughness of film materials are rather important for their industrial applications. As a new class of films, graphene oxide films (GOFs) attract intense attention in many applications but are frequently divergent, inconsistent, and poorly reproducible in their mechanical properties. In this study, we first demonstrate that different chemical compositions and assembly structures probably are responsible for the difference in elongations between cast GOFs and filtration GOFs. Comprehensive analysis of the morphologies and mechanical properties indicates that the enhanced elongation of the thick cast GOFs is mainly attributed to the presence of a unique skin-wrinkles-skin structure, which more easily forms in cast GOFs than in filtration counterparts. On the basis oScientific reports13102https://www.ebi.ac.uk/biostudies/studies/S-EPMC4550846biostudies-literatureFracture Mechanism and Toughness Optimization of Macroscopic Thick Graphene Oxide Film.PMC4550846Feng JYe SChen BfalseFracture Mechanism and Toughness Optimization of Macroscopic Thick Graphene Oxide Film.Combined high strength and toughness of film materials are rather important for their industrial applications. As a new class of films, graphene oxide films (GOFs) attract intense attention in many applications but are frequently divergent, inconsistent, and poorly reproducible in their mechanical properties. In this study, we first demonstrate that different chemical compositions and assembly structures probably are responsible for the difference in elongations between cast GOFs and filtration GOFs. Comprehensive analysis of the morphologies and mechanical properties indicates that the enhanced elongation of the thick cast GOFs is mainly attributed to the presence of a unique skin-wrinkles-skin structure, which more easily forms in cast GOFs than in filtration counterparts. On the basis o2015-01-01T00:00:00Z2015 Aug2025-04-26T12:31:56.771Z2019-03-27T01:57:23ZS-EPMC45508462631083510.1038/srep13102