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In the present study the stress transfer mechanism in graphene-polymersystems under tension is examined experimentally using the technique of laserRaman microscopy. We discuss in detail the effect of graphene edge geometry,lateral size and thickness which need to be taken under consideration whenusing graphene as a protective layer. The systems examined comprised ofgraphene flakes with large length (over ~50 microns) and thickness of one tothree layers simply deposited onto PMMA substrates which were then loaded totension up to ca. 1.60% strain. The stress transfer profiles were found to belinear while the results show that large lateral sizes of over twenty micronsare needed in order to provide effective reinforcement at levels of strainhigher than 1%. Moreover, the stress-built up has been found to be quitesensitive to both edge shape and geometry of the loaded flake. Finally, thetransfer lengths were found to increase with the increase of graphene layers.The outcomes of the present study provide crucial insight on the issue ofstress transfer from polymer to nano-inclusions as a function of edge geometry,lateral size and thickness in a number of applications.

Stress-transfer from polymer substrates to monolayer and few-layer graphenes