SYNTHESIS OF COMPOSITE MEMBRANE BASED ON GRAPHENE OXIDE AND NANOSTARCH

Intensive research of nanocomposites contributes to the development of new materials in the fields of medicine, nanoelectronics, high dielectric materials, energy, biotechnology and information technology. Therefore, the synthesis of new materials by modifying of grapheme oxide with nanostarch and the study of its properties are of great interest. In this study, nanocomposite membrane was synthesized by modifying of graphene oxide in a 1:1 volume ratio with nanostarch and their chemical structures were studied by fourier-transform infrared spectroscopy and ultraviolet spectroscopy. The results of the study showed the absorption of the etheric bond C=O in the ultraviolet spectrum at full length was 243 nm. The infrared spectrum showed new etheric bonds O=C-OH at a wavelength of 1150 cm^-1. The scanning electron microscopy analysis indicates that grapheme oxide is homogeneously coated by starch, it means that nanostarch was successfully polymerized on the surfaces of graphene oxide nanosheets and formed sandwich-like structures. The X-Ray diffraction analysis indicatedthat the crystalline structure changes to amorphous to a certain extent due to the ester bond formed between graphene oxide and starch. The electrical properties showed the resistivity of the initial graphene oxide was ρ = 5.53·10³ Ohm·m and after its modification by starch, the resistivity of the graphene oxide/starch membrane increased by 2 orders, which was equal to 2.59·10⁵ Ohm·m. According to the results, high dielectric materials are very important in electrical and electronics engineering. Therefore, there is no doubt that there will be great interest in this field.

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