2 Graphene Layers May Be Better Than 1 (image) National Institute of Standards and Technology (NIST) Share Print E-Mail Caption NIST measurements show that interactions of the graphene layers with the insulating substrate material causes electrons (red, down arrow) and electron holes (blue, up arrow) to collect in "puddles." The differing charge densities creates the random pattern of alternating dipoles and electon band gaps that vary across the layers. Credit NIST Usage Restrictions None Share Print E-Mail 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.