Nanoribbon Building Blocks (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption This image shows bottom-up synthesis of graphene nanoribbons from molecular building blocks (left). The resulting ribbon, or heterojunction, has varied widths as a result of different width molecules; and a scanning transmission microscope image of graphene nanoribbon heterojunction (right), with larger-scale inset of multiple ribbons. Credit Berkeley Lab 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.