Carbon Quantum Dots

Carbon Quantum Dots (CQD's) are spherical particles formed by piled graphene fragments with particles sized less than 10 nm and functional groups on the surface. They can create high-performance nanocompounds that can be attained from many natural carbon sources. Due to this reason, many studies seek to produce CQD's via simple synthesis methods using low-cost precursors, such as residual organics like coffee powder. In this chapter, the synthesis methods of CQD's were summarized, and their luminescence mechanism was analyzed.