Tiny tunable nanotubes (IMAGE) Duke University Caption Scientists at Duke University have developed a method that switches a carbon nanotube from acting like a metal to acting like a semiconductor and back again, by wrapping it with a ribbon-like polymer. Credit George Bullard Usage Restrictions Please credit George Bullard License Original 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.