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International Conference PhysicA.SPb/2021 IOP Publishing Journal of Physics: Conference Series 2103 (2021) 012103 doi:10.1088/1742-6596/2103/1/012103 Properties of graphene surface and its interaction with adsorbates are extremely dependent on the number of graphene layers [11]. Thus, we analyzed the shape of the 2D line in the Raman spectra of the samples under study to figure out the share of bilayer graphene inclusions on the surface of each chip and the distrubution of bilayer domains. The 2D line has a symmetric Lorentzian shape in case of monolayer graphene, and an asymmetric shape described by four Lorentzians in case of bilayer, whose 2D line FWHM is twice that in the case of a monolayer [12]. Thus. the FWHM distribution map of the 2D line was analyzed to determine the fraction of bilayer graphene for every sample. According to this analysis, the samples can be divided into two groups: with larger (~30 %) and smaller (~5 %) share of bilayer graphene. The maps for two characteristic samples showing the distribution of bilayer inclusions in the areas of 7 × 7 μm2 are shown in Figure 4. Figure 4. Raman maps of the 2D line FWHM distribution for two chips under study: (a) for the chip with ~30 % of bilayer inclusions, (b) for the chip with ~5% of bilayer inclusions. After treatment of the chips in mode II, the variation of the surface potential was approximately 10 mV (Figure 5, curve 2). With a larger amount of bilayer graphene (up to 30%), the variation of the surface potential is higher - up to 20-40 mV (Figure 4, curve 2). This can be connected with smaller chemical reactivity of bilayer graphene in comparison to monolayer [13]. Figure 5. Typical surface potential profiles of the graphene chips with different share of bilayer graphene inclusions: 30% (black curve) and less than 5% (red curve) after treatment at mode II. The surface potential distribution profiles were extracted from the surface potential distribution maps obtained from 10 × 10 μm2 area. 5PDF Image | electrolysis-related modification of graphene films
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