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. 2015 Sep 8;5:13785. doi: 10.1038/srep13785

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(a) The Schematic diagram of two-layer 3D Ta₂O_5-x/TaO_y RRAM with graphene edge electrode; the physical structure was characterized by (b) TEM image and (c) magnified false-color EELS map in cross-sectional view and (d) optical microscope image in top view; (e) the Raman spectra indicated the single layer graphene; (f) The fabrication flow of the single 3D RRAM cell.