Blister formation during graphite surface oxidation by Hummers’ method

Abstract

Graphite oxide has a complex structure that can be modified in many ways to obtain materials for a wide range of applications. It is known that the graphite precursor has an important role in the synthesis of graphite oxide. In the present study, the basal-plane surface of highly annealed pyrolythic graphite (HAPG) was oxidized by Hummers’ method and investigated by Raman spectroscopy and atomic force microscopy. HAPG was used as a graphite precursor because its surface after cleavage contains well-ordered millimeter-sized regions. The treatment resulted in graphite intercalation by sulfuric acid and blister formation all over the surface. Surprisingly, the destruction of the sp2-lattice was not detected in the ordered regions. We suggest that the reagent diffusion under the basal plane surface occurred through the cleavage steps and dislocations with the Burgers vector parallel to the c-axis in graphite.

Characterization of nanoblisters on HOPG surface

“…Braking of interplanar bonds at HOPG near-surface area and appearance of round-shaped blisters were reported before [4]- [6]. Our study contributes to this field by confirmation of the theoretical work of Tang and Cao [7] about stronger adsobtion of NO 3 in comparison to other nitrogen oxides.…”

Influence of microstructure of graphite precursor on formation of graphite oxide

“…In par ticular, blisters with a diameter from 14 to 1430 nm and a height of 0.5-187 nm were found on it. In this case, surface oxidation did not occur, which is confirmed by Raman spectroscopy [11].…”

“…В частности, на ней обнаружены блистеры с диаметром от 14 до 1 430 нм и высотой 0,5-187 нм. В данном случае окисления поверхности не произошло, что под тверждается данными спектроскопии комбина ционного рассеяния [11].…”

Bionanoscopy: an educational and research center and a shared use of equipment center

“…Бионаноскопия: учеБно-научный центр и центр коллективного пользования Bionanoscopy: an educational and research center and a shared use of equipment center DOI: 10.22184/1993DOI: 10.22184/ -8578.2018 Г.Мешков 1 , А.Ахметова 1,2,3 , Ю.Белов 1,2,3 , И.Яминский 1,2,3 G.Meshkov 1 , A.Akhmetova 1,2,3 , Yu.Belov 1,2,3 , I.Yaminsky 1,2,3 Центр коллективного пользования "Бионаноскопия" в составе одноименного учебно-научного центра проводит измерения морфологии и свойств биообъектов методами атомно-силовой микроскопии и сканирующей туннельной микроскопии. Основные направления работы ЦКП "Бионаноскопия" -приоритетные исследования в области биофизики, молекулярной биологии, вирусологии, микробиологии и молекулярной медицины.…”

“…С и с п о л ь з о в а н и е м о б о р у д о в а н и я Ц К П "Бионаноскопия" подготовлено более 120 статей, 20 из которых ( [2][3][4][5][6][7][8][9][10][11][12] и другие) опубликованы за последние три года в журналах, входящих в рейтинговые системы Web of Science и Scopus.…”