▎ 摘　　要

NOVELTY - Preparing graphene, which is free from metal contamination, and magnetic and organic impurities, comprises reacting a graphene oxide dispersion, in a solvent or its mixture, with at least one tin compound, and optionally with at least an acid compound, and acid washing the mixture. USE - The method is useful for preparing graphene, which is useful for manufacturing transparent electrodes, batteries, acceptor and electron donor materials including photovoltaics, photovoltaic panels, channel transistors including electronics, transmitters or nonlinear absorbers of infra-red photons, current conducting electrodes, antistatic coatings, chemical detectors, vias and interconnects in electronics, current carrying wire and solar cells (all claimed). ADVANTAGE - The method simply and easily prepares graphene with high quality and without metal contamination, and magnetic and organic impurities in an economical manner; and is carried out repeatedly without using sophisticated equipments.