Optics and Photonics Society of Iran

In this research, graphene quantum dots have been produced by two methods and their optical properties have been investigated. In the first method, which is the common method, graphene quantum dots are produced by pyrolyzing acid and then neutralizing the solution. In the second method, which is an almost new method, the graphene quantum dots are produced using citric acid and ethylenediamine, and its optical properties are compared with the first method. The TEM image is taken from the solution and the particle size is specified. The FTIR spectrum indicates the presence of chromophore functional groups in the solutions that cause the luminescence of the solutions. The UV-Vis spectrum also shows two peaks in the ultraviolet region due to electron transitions in this region. Also, the energy gap of two solutions were obtained as 3.98 and 4.04 eV.