Large‐Scale Synthesis of Rings of Bundled Single‐Walled Carbon Nanotubes by Floating Chemical Vapor Deposition

Rings of bundled single-walled carbon nanotubes with perfectly toroidal geometries (see figure), are fabricated in high yields by a floating chemical vapor deposition process involving the thermal decomposition of acetylene. The nanotube rings can be grown with varying densities on a wide variety of substrates at relatively low temperatures, which is a significant advantage for nanoelectronics applications.