SYNTHESIS OF TURBOSTRATIC GRAPHENE UNDER THE CONDITIONS OF FLASH PLASMA-CHEMICAL PYROLYSIS OF CARBON-CONTAINING RAW MATERIALS

Consideration has been given to the energy-efficient process of synthesis of graphene with a turbostratic structure via flash plasma-chemical pyrolysis (flash-pyrolysis) from technical carbon and electrode graphite in a pulsed spark discharge with a duration from 20 to 500 ms. A setup is suggested that, compared to the prototype, is distinguished by increased energy efficiency and the possibility to conduct the process in an energy-saving regime due to the use of a condenser battery discharge in the circuit instead of a nonlinear condenser resistor and a diod voltage multiplier. The formation of a graphene structure is confirmed by the Raman spectroscopy (RS) using the intensity peaks in the range of 2424 cm –1 . The yield of turbostratic graphene was determined by the integral characteristics of the attenuated total reflectance of the radiation in the infrared region. The investigations of the carbon product (graphene soot) obtained in the process of flash plasma-chemical synthesis showed a content of turbostratic graphene of up to 15–20 wt.%. The obtained results are substantiated by the methods of RS- and FT-IR spectroscopy and also by the new method of qualitative control of the graphene content using integral transmission coefficients determined with the help of IR-spectroscopy of attenuated total reflectance

Author:  M. Yu. Dolomatov, O. L. Ryzhikov, V. R. Subkankulov, S. S. Vershinin, and V. V. Lazarev
Keywords:  plasma-chemical pyrolysis, turbostratic graphene, modified plasma-chemical flash-pyrolysis plant, IR spectrum, RS spectrum
Page:  713