Nanotube Device (IMAGE) University of Tokyo Caption Various iterations of the experimental nanotube device. Images captured by an atomic force microscope, and a scanning Kelvin probe microscope (lower right). Credit © 2019 Iwasa et al. Usage Restrictions © 2019 Iwasa et al. 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.