Graphene Boron/Nitride Sandwich (IMAGE) University of California - Riverside Caption An illustration showing single layers of graphene with thin layers of insulating boron nitride that form a sandwich structure. Credit Qiong Ma 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.