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. 2019 Mar 7;9:3777. doi: 10.1038/s41598-019-40534-5

Figure 2.

Figure 2

Raman spectra of graphene-coated Cu and bare Cu surfaces after 100 h of THS testing. Spectrum of SLG (shiny area) shows small D peak without Cu oxide peaks. Dark area of SLG and bare Cu spectra show different peak intensities of Cu2O and CuO depending on the density of Cu oxide present.