TRANSPARENT CONDUCTING GRAPHENE FILM BASED HYBRID MATERIAL PRODUCTION METHOD Russian patent published in 2018 - IPC C01B32/184 B82B3/00 B82Y40/00 H01L41/18 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the electrical engineering, chemical industry, nanotechnology and can be used in the touch screens and liquid crystal screens manufacturing, solar energy converters, LEDs. First, natural graphite is heat treated and natural graphite slurry is prepared at concentration of not more than 6 mg/ml in the aqueous medium, which may contain surfactants or dispersing agents. Then performing the ultrasonic treatment to produce the low-layer graphene particles suspension, which is dried in air at temperature of not more than 40–50 °C. Resulting graphene direct exfoliation powder is re-dispersed in the ultrasonic bath with power of at least 90 W for at least 15 minutes in aqueous organic medium, which is mixture of organic solvent and water, purified by the reverse osmosis to specific electrical conductivity of no more than 30 mcS/cm. Resulting graphene suspension is centrifuged at room temperature with the total impact of not less than 120,000 rev, with the sediment weight of not more than 90 % of the graphene suspension initial weight, and with the graphene suspension specific conductivity of not less than 80 mcS/cm. By the Langmuir-Blodgett method the transparent conductive graphene suspension is applied onto the piezo substrate , in the capacity of which using the lithium niobate, PZT ceramics, quartz, piezoelectric polymer material, for example, preliminarily chemically etched polyvinylidene fluoride copolymer, treated with solvents such as water, ethyl alcohol, acetone, hexane, petroleum ether, as well as polishing, after which drying at residual pressure of no more than 10 mm Hg. and temperature of not more than 120 °C. Onto the substrate surface more than one film can be applied. Producing the X or Y type transparent conductive graphene film, which is hybrid material with the light transmittance of not less than 85 % in the optical range of 400–800 nm and surface electric resistance at constant current of not more than 1 kΩ.

EFFECT: method according to the invention is environmentally friendly and cost efficient.

8 cl, 6 dwg, 2 tbl