Self-powered sensor (IMAGE) Washington University in St. Louis Caption Micrograph of the quantum tunneling sensor chipset and the matched Fowler-Nordheim tunneling barriers. Credit Chakrabartty Lab, McKelvey School of Engineering, Washington University in St. Louis Usage Restrictions Use allowed with proper attribution 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.