Graphene's Functionalization Reaction (IMAGE) Institute for Basic Science Caption The sodium-potassium alloy (NaK) in solution forms a sodium ion (Na?) when it meets the crown ether molecule (15-crown-5). Na? reduces graphene and makes it more reactive towards other molecules (R). The "decorated" graphene has several potential applications. Credit IBS Usage Restrictions None 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.