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Information × Registration Number 0218U000209, 0115U003208 , R & D reports Title Magnetic properties of graphene-based nanostructures popup.stage_title Head Adamyan Vadym Movsesovich, Registration Date 06-02-2018 Organization Odessa I.I.Mechnikov National University popup.description2 An effective simplified approach to the theoretical analysis of electronic properties of graphene, based on the modification of the known method of potentials of the zero radius (PNR), was developed and verified. This approach allows, being distracted from nonessential details, using only the atomic properties of carbon and the peculiarities of the geometric structure of graphene without the use of particle parameters, to obtain its electronic characteristics. Based on the two-dimensional elastic continuum model and using an approach that goes beyond the quasigarmonic approximation, a theory is developed that describes the characteristic features of the thermal expansion of graphene. We obtained the negative value of the coefficient of thermal expansion of graphene at low temperatures and the change of its sign at T = 1000 K. It is shown that the bending vibrational mode plays a decisive role in the features of the thermal compression / expansion of graphene and that the contribution of this mode to the coefficient of thermal expansion does not depend on the size of the model, due to the "sound" nature of the long-wave dispersion of the flexural mod. Product Description popup.authors Бондарев Віктор Миколайович Завальнюк Володимир Вікторович Махлайчук Віктор Миколайович Махлайчук Павло Вікторович Роговська Ємма Тадеушевівна Шаповалов Ігор Петрович popup.nrat_date 2020-04-02 Close