Graphene flake (IMAGE) University of Göttingen Caption The gold contacts are shown as yellow, the graphene double layers red, and the metal bridge blue. Credit Fabian Geisenhof/Jakob Lenz Usage Restrictions No restrictions. License Public Domain 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.