▎ 摘　　要

NOVELTY - Production of branched graphene quantum dot involves dissolving a carbon precursor and a ligand precursor in a solvent to prepare a precursor solution, and heating the precursor solution to prepare a core containing graphene and a ligand surrounding the core. The carbon precursor comprises 1-20C carboxylic acid. The ligand precursor comprises an amine group and a hydroxyl group. The core is derived from the carbon precursor. The ligand is derived from the ligand precursor. The core has a carbon content of 50-80 atomic%, an oxygen content of 10-30 atomic%, a nitrogen content of 5-25 atomic%. The branched graphene quantum dot has an absorption peak (p1) at wavelength of 300-350 nm, and an absorption peak at the wavelength of 350-400 nm. USE - Production of branched graphene quantum dot used for yarn (claimed) used in chemical sensor, nanoelectronics and optoelectronic applications. ADVANTAGE - The method enables production of branched graphene quantum dot having improved optical property, antibacterial property, uniform particle distribution, improved luminous property, and can receive light in a low wavelength range such as UV light and efficiently generate light. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a yarn, which comprises a polymer resin, and the graphene quantum dots. The yarn has an antibacterial effect of 99% or more as measured by producing a fabric by the yarn and measuring has the antibacterial effect as measured according to .