▎ 摘　　要

NOVELTY - Graphene quantum dots are prepared by adding organic starting material which is a hydrophilic compound containing functional groups e.g. carboxyl group and/or hydroxyl groups to vessel and heating organic starting material to a temperature within 20 degrees C of the boiling point of the organic starting material for less than or equal to 10 minutes. USE - Formation of graphene quantum dots for imaging and sensing applications. ADVANTAGE - Non-toxic and natural precursors and common reaction materials are used. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) sensing method of graphene quantum dot which involves heating organic starting material to a temperature within 20 degrees C of the boiling point of the organic starting material for less than or equal to 10 minutes, exciting graphene quantum dot with light having a 1st wavelength, and measuring light emitted by excited graphene quantum dot at a 2nd wavelength different from the 1st wavelength; and (2) graphene quantum dot containing 55-65% carbon atoms, 30-40% oxygen atoms, and 3.5-7.5% nitrogen atoms in which amount of nitrogen is 6-11% with respect to carbon atoms present in the graphene quantum dots. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the formation of graphene quantum dots through pyrolysis of glutamic acid.