Close-up of Pure-Edge Contact in Graphene (IMAGE) Columbia University Caption After first encapsulating graphene in boron nitride, the multilayer stack is etched to expose only the very edge of the two-dimensional graphene layer. Electrical contact is then made by metalizing along this one-dimensional edge. Credit Columbia Engineering; illustration, Cory Dean 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.