Luminescent properties of graphene quantum dots (GQDs) functionalized with LCysteine

Graphene quantum dots (GQDs) are one of the most uprising nanomaterials that have been used in biomedical applications because of their interesting luminescent properties. This work presents a facile way to attach the LCysteine onto the surface of GQDs, which enhances the applicability of the final molecules in biomedical applications. Furthermore, the luminescent properties of synthesized GQDs and LCysteine-GQDs with different methods of prevalent spectroscopy. The obtained GQDs- LCysteine show a red shift in PL results with an increase in wt.% LCysteine compared to GQDs. According to the results, this platform has the potential to be used in many biological applications, such as bio-imaging and bio-labeling.