Study On The Spectroscopy Properties Of Nitrogen Doped Graphene Quantum Dots And Sulfur - Nitrogen Co-Doped Graphene Quantum Dots

In this work, we present a method to fabricate nitrogen-doped Graphene (N-GQDs) and sulfur - nitrogen co-doped graphene quantum dots (S,N-GQDs) and investigate their optical properties. The GQDs are prepared using a microwave-assisted hydrothermal method, which is a simple, environmentally friendly approach that allows for easy dispersion in water and quick application. Structural and morphological analyses reveal that the material has a nanostructure with a size ranging from approximately 4.5 to 9.5 nm and their characteristic bonds are present. The effects of different dopants in GQDs crystal lattice on the optical properties are also systematically analyzed. Additionally, we provide an in-depth discussion of the luminescence mechanism.