▎ 摘　　要

NOVELTY - Preparing yttrium barium copper oxide composite graphene coating comprises e.g. (i) dissolving metal organic salt of yttrium precursor, barium metal organic salt and copper metal organic salt in a mixed solvent of propionic acid and ethanol, and adding graphene oxide, and carrying out ultrasonic dispersing to obtain graphene-containing yttrium barium copper oxide precursor liquid, (ii) coating yttrium barium copper oxide precursor solution of step (i) on the lanthanum aluminate substrate by spin coating, then placing in a quartz tube furnace for pyrolysis, and introducing humid oxygen atmosphere into the quartz tube furnace during the pyrolysis process, then heating and cooling to obtain yttrium barium copper oxide precursor film, and (iii) placing yttrium barium copper oxide precursor film obtained in (ii) in a quartz tube furnace, then introducing humidified argon-oxygen gas mixture into quartz tube furnace, and heating and insulating for oxygen treatment and cooling. USE - The method is useful for preparing yttrium barium copper oxide composite graphene coating. ADVANTAGE - The yttrium barium copper oxide composite graphene coating: has improved superconducting properties; and promotes c-axis orientation growth. DETAILED DESCRIPTION - Preparing yttrium barium copper oxide composite graphene coating comprises (i) dissolving metal organic salt of yttrium precursor, barium metal organic salt and copper metal organic salt in a mixed solvent of propionic acid and ethanol to an atomic ratio of yttrium: barium: copper is 1:1.5-2:3, and adding graphene oxide during the stirring and dissolving process, and carrying out ultrasonic dispersing to obtain graphene-containing yttrium barium copper oxide precursor liquid having a total cationic molar concentration of 1.5 mol/l; the volume ratio between propionic acid and ethanol in the mixed solvent is 4:1, and the mass of graphene oxide in the precursor liquid is 0.5-10% mass of metal organic salt of yttrium precursor, (ii) uniformly coating yttrium barium copper oxide precursor solution of step (i) on the lanthanum aluminate substrate by spin coating, and then placing in a quartz tube furnace for pyrolysis, and introducing humid oxygen atmosphere into the quartz tube furnace during the pyrolysis process and heating from room temperature to 190 degrees C at a rate of 3 degrees C/minute for 1 hour and then heating to 500 degrees C at a rate of 5 degrees C/minute for 10 minutes and cooling to room temperature with the furnace to obtain yttrium barium copper oxide precursor film, and (iii) placing yttrium barium copper oxide precursor film obtained in (ii) in a quartz tube furnace, then introducing humidified argon-oxygen gas mixture into quartz tube furnace, and heating to 800 degrees C at a rate of 200 degrees C/minute, and insulating for 1-2 hours, when the furnace temperature is lowering to 450 degrees C, and then insulating for 1 hour for oxygen treatment and cooling the furnace to room temperature to obtain final product.