Carbon Nanofibers on Copper Foil (IMAGE) North Carolina State University Caption This scanning transmission electron micrograph of carbon nanofibers grown on copper foil and elemental maps shows the presence of both nickel and copper in the catalyst nanoparticles. Credit James LeBeau, North Carolina State University Usage Restrictions Image credit must be given. 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.