Diameter control of single-walled carbon nanotube forests from 1.3-3.0 nm by arc plasma deposition

We present a method to both precisely and continuously control the average diameter of single-walled carbon nanotubes in a forest ranging from 1.3 to 3.0 nm with similar to 1 angstrom resolution. The diameter control of the forest was achieved through tuning of the catalyst state (size, density, and composition) using arc plasma deposition of nanoparticles. This 1.7 nm control range and 1 angstrom precision exceed the highest reports to date.