Khazieieva O. Structure and spectral properties of mechanochemically obtained graphene, graphene oxides and graphene-like molybdenum disulfide.

It was developed productive and environmentally friendly mechanochemical methods to produce graphene, graphene oxides (GO) with different oxidation degree and two-dimensional molybdenum disulfide MoS2 (2D MoS2), investigated the basic physical and chemical principles of these processes and their influence on the structure and spectral characteristics of obtained 2D materials. It was shown that graphene may be obtained by the mechanochemical graphite nanoexfoliation in the presence of chemically inert exfoliating solid agent (NaCl, KCl, KBr, Na2SO4, MgSO4, CaCO3) with subsequent liquid phase exfoliation. The fraction of monolayer graphene in dispersions can amount to 70%. For the first time we described the possibility to produce graphene with different oxidation level by solid phase graphite mechanochemical processing in the presence of an oxidant (potassium permanganate, ammonium persulfate) and subsequent liquid phase exfoliation of graphite in water. It was established that mechanical activation of graphite with KMnO4 reaction in the presence of stoichiometric amount of sulfuric acid may allow to obtain GO with high oxidation level without the use of ultrasound. Through the example of MoS2 for the first time it was shown the ability of using developed mechanochemical graphene obtaining method for 2D transition metals dichalcogenides synthesis.