Bronze Nanotubes with Unusual Symmetry (image) Technical University of Munich (TUM) Share Print E-Mail Caption A string of tin atoms is surrounded by a layer of copper atoms, and around that yet another tube of tin atoms. Such fibers could one day be used as molecular wires with various electrical properties. Credit Andrea Hoffmann / TUM Usage Restrictions None 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.