One-Step Preparation and Characterization of Graphene Oxide Quantum Dots and Investigation of the Effect of Thiourea and Ammonia S, N on the Optical Properties of the Synthesized Quantum Dots

Luminescent graphene oxide quantum dots have attracted tremendous attention from the scientists in chemistry, materials science, physics and biology, because of their superiority of good stability, excellent optical and electrochemical properties, resistance to photo-bleaching, and low cytotoxicity. In the research, Graphene oxide quantum dot were synthesized using a simple and direct method. In the following, to increase and change the luminescence, graphene oxide doped with nitrogen N and sulfur S in a single step in the presence of thiourea and ammonia were synthesized. the graphene oxide quantum dots were characterized by infrared, UV–Vis absorption, photoluminescence spectroscopy, and TEM microscopy. S and N doped graphene oxide quantum dots, unlike the base graphene oxide quantum dots, have a blue luminescence and higher intensity than their base counterpart. Because of this prominent luminescence feature, N and S doped graphene oxide quantum dots can be used for medical imaging and other optical applications.