▎ 摘　　要

NOVELTY - Preparing different sheet layers of graphene oxide sheets/LCD/ films, comprises (i) dispersing graphite oxide in a solvent, formulating into suspension, ultrasonicating, centrifuging, extracting lower layer, removing the solvent to obtain a sample of graphene oxide sheets; (ii) concentrating the graphene oxide sheets by centrifugation, taking the lower liquid, and removing the solvent to obtain graphene oxide crystal; and (iii) coating the obtained liquid crystal droplets on graphene oxide substrate, and drying at 15-35 degrees C, to obtain graphene oxide films. USE - The method is useful for preparing different sheet layers of graphene oxide sheets/LCD/films (claimed). ADVANTAGE - The method ensures zero loss of raw materials, has short film assembly cycle. The resulting film has an optical security capabilities and good prospects for development in the field of security. DETAILED DESCRIPTION - Preparing different sheet layers of graphene oxide sheets/LCD/ films, comprises (i) dispersing graphite oxide in a solvent, formulating into 0.05-0.5 wt.% suspension, ultrasonicating for 20-60 minutes, then centrifuging at 8000-20000 revolutions per minute, extracting lower layer at intervals of 0.5-3 hours once and labeling as a set of samples, until the supernatant is colorless and transparent, then removing the solvent to obtain a sample of graphene oxide sheets, increasing the extraction time of the resulting graphene oxide sheets, until the lamella decreases; (ii) concentrating the graphene oxide sheets by centrifugation at same centrifugal speed as in step (i), taking the lower liquid, and removing the solvent to obtain graphene oxide crystal; and (iii) coating the obtained liquid crystal droplets on graphene oxide substrate, and drying at 15-35 degrees C, to obtain graphene oxide films.