▎ 摘　　要

NOVELTY - Manufacturing nanoparticles of a target material comprises: mixing graphene oxide with an aqueous solvent to prepare an aqueous solution; mixing the target material with an organic solvent to prepare an organic solution; mixing the aqueous solution with the organic solution; and preparing nanoparticles of the target material by the graphene oxide. USE - The method is useful for manufacturing nanoparticles of a target material including an organic material, an inorganic material, and/or a metallic material, or a polymer, a monomolecule, an organic semiconductor, a metal, an alloy, a metal oxide, and/or a mineral, or a conjugated polymer, where the nanoparticles are useful in: an electronic device including an organic LED, a solar cell, a printing device, a bioimaging device, and a sensor (all claimed), where the printing device includes inkjet printing device, spin coating device, roll-to-roll printing device, and screen printing device; display elements such as a field emission display, a LCD and a LED; battery cells such as a supercapacitor and a fuel cell; and nanodevices such as a field effect transistor, a memory device, and an electrical device such as a hydrogen storage device, and an optical fiber. ADVANTAGE - The method is capable of manufacturing nanoparticles of the target material with high yield, improved electrical and optical properties, and high efficiency in an environmentally-friendly manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for nanoparticles comprising the target material, and graphene or its oxide formed on a surface of the target material.