▎ 摘　　要

NOVELTY - Preparing graphene comprises forming an organic thin film on a substrate, irradiating an upper portion of the organic thin film with radiation to cross-link the organic thin film, and carbonizing the cross-linked organic thin film to form graphene. USE - The method is useful for preparing a conductive material such as graphene (claimed), which is useful for a conductive thin film, a transparent electrode, or a memory device (all claimed), where the graphene is useful: in electric and electronic fields, bio-fields and energy fields such as an ultra-speed transistor, a flexible memory device, a biomimetic device and a solar cell; and for applying organic light emitting device or a non-volatile organic memory device. ADVANTAGE - The method provides graphene with high quality, improved charge mobility, current density characteristics, structure and thermal conductivity, chemical resistance, flexibility, elasticity, applicability, mechanical, thermal and electrical properties in a simple and economical manner.