Coal-Derived Graphene Quantum Dots (IMAGE) Rice University Caption Coal-derived graphene quantum dots as seen under an electron microscope. Rice University scientists have modified the dots to serve as antioxidants. Credit Tour Group/Rice University Usage Restrictions Credit must be used. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.