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Investigations of graphene nanosheets and oxidized graphene nanosheets were carried out using X-rayphotoelectron spectroscopy. Scanning and transmission electron microscopy investigations were used in additionto X-ray photoelectron spectroscopy. It was found that functional carboxyl and epoxide groups were removedfrom samples due to argon bombardment in studies of oxidized graphene nanosheets with X-ray photoelectronspectroscopy. Thus the ОKα-band was not revealed in oxidized graphene nanosheets owing to oxygen removaldue to electron bombardment with the use of. ultra-soft X-ray emission spectroscopy. Keywords: X-ray photoelectron spectroscopy, electronic structure, graphene nanosheets, oxidized graphenenanosheets.