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- Title
SYNTHESIS OF GRAPHENE - NEW NANOMATERIAL FOR ELECTRONIC’S PURPOSE.
- Authors
Yovkova, Fila; Markovska, Irena; Mitkova, Magdalena
- Abstract
Graphene is an amazing material, with many potential applications, that continues to impress scientists around the world with its structure and composition. Graphene also opens up many possibilities in electronics. One of the areas for which graphene is studied and developed is to be used in the supercapacitor’s manufacture. Graphene is known as the first two-dimensional nanomaterial. Graphene displays remarkable electron mobility at room temperature. This makes it very suitable for coating the electrodes of supercapacitors. The supercapacitor is an energy storage device with a high power density that can charge / discharge in quick time and has long term cyclic stability. It is believed in the near future will be developed supercapacitor to store more energy than battery. One direction in which research is going to improve the capacitive characteristics of capacitors is the use of nanographene structures as coating on capacitor electrodes. The graphene-based supercapacitor thin coating would be able to be fully charged in a matter of minutes. There are various methods to synthesize graphene and its derivatives. The main difficulties in obtaining graphene are related to: the inability to obtain a high quality sample in significant quantities; adjusting the number of layers. Novoselov's method (micromechanical exfoliation of graphite layers) does not give us high product quality or high yield. It is necessary to overcome the energy of the connection of the Van der Waals interactions between the layers without disturbing the first, second and subsequent layers, which is difficult. In this connection in the present work was synthesized graphene from very pure, finely dispersed graphite (99.9%) by applying electrolysis and ultrasound. Graphene is obtained as a result of a combination of chemical and physical treatment. Sulfuric acid was used as the electrolyte. It loosens the weak Van der Waals bonds and, together with the acoustic action of ultrasound, contributes to the cleavage of the individual layers of graphene. As a precursor for graphene synthesis fine graphite (> 99% purity) have used, which burns without residue when have been heated. 200 ml of deionized water is poured into a beaker, 8 ml of 4N H2SO4 and 5 g of pure fine graphite G0 were additionally added, then the mixture is well homogenized. Electrolysis and ultrasound treatment take place simultaneously. The experiment was performed at a temperature of 17 - 30 ° C and an ultrasound frequency of 40kHz. The samples were then filtered and the solid residue was dried at 110 ° C for 5 hours. The time of ultrasound treatment is the same for all samples - 30 minutes, while the time of electrolysis is with different duration - 5, 10, 15 and 30 minutes. The obtained graphene was examined mainly by using microscope methods.
- Subjects
GRAPHENE synthesis; NANOSTRUCTURED materials; ELECTRON mobility; SUPERCAPACITORS; ULTRASONIC imaging
- Publication
Knowledge: International Journal, 2020, Vol 42, Issue 3, p519
- ISSN
2545-4439
- Publication type
Article