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International Conference PhysicA.SPb/2021 Journal of Physics: Conference Series 10-9 10-10 2103 (2021) 012103 IOP Publishing doi:10.1088/1742-6596/2103/1/012103 z H/ 2 10-11 V , SV -12 10 -13 10 10-14 10-15 10-16 10-17 1/f 100 1000 f, Hz 4 3 2 1 100000 1 10 10000 Figure 1. Dependence of the spectral density of voltage fluctuations (SV) on frequency for the graphene chips from plate 19 (curves 1 and 2) and plate 35 (curves 3 and 4) after the electrolysis at Mode I (curves 2 and 4) and at Mode II (curves 1 and 3). Table 1. Estimated parameters of the samples under study. Chip name Sv, V2/Hz (LF-noise at 1.22 Hz) Before electrolysis After Mode I (-0.2 V) 5,2*10-10 2.5*10-11 After Mode II (0.8 V) 1.26*10-11 1.60*10-12 35-61 5.0*10-11 35-21 4.4*10-11 19-21 7.8*10-12 19-31 9.0*10-12 Figure 1 and Table 1 point out the changes in the degree of defectiveness of the graphene surface after treatment since the SV values integrally characterize the defectiveness of the material. As it was mentioned above, graphene electrolysis treatment with negative potential applied on it may lead to an increase of oxygen group concentration on its surface. In this regard, a decrease in the graphene defectiveness degree after treatment in Mode II is in good agreement with the well-known mechanism of reducing the density of surface states at the Si-SiO2 surface, when oxygen groups are introduced during its formation. The KPFM measurements provided an assessment of the homogeneity of the surface potential before and after electrolysis. Variation of the surface potential on the initial samples was 25-50 mV (Figure 2, curve 2). After treatment of the surface of these samples in an aqueous electrolyte in mode II, we observed a significant decrease in the surface potential variation down to 5 mV (Figure 2, curve 3). However, treatment of the samples in mode I was accompanied by an increase in the variation of the surface potential values up to 150 mV (Figure 2, curve 3). In the context of the fact of an increase in low-frequency noise such an increase in the surface potential variation can be interpreted as an increase in the degree of defectiveness of the graphene film. 3PDF Image | electrolysis-related modification of graphene films
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