GNR Dragged over Gold Surface (image) University of Basel Share Print E-Mail Caption A graphen nanoribbon was anchored at the tip of a atomic force microscope and dragged over a gold surface. The observed friction force was extremely low. Credit University of Basel, Department of Physics Usage Restrictions Give adequate credit. 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.