[nthompson]

Can you selectively grow semiconducting tubes, or metallic tubes, or do you only get a mixture of semiconducting and metallic?

[SaratogaEnergy]

We grow conductive multi-walled carbon nanotubes. Some of the layers may be semi-conductive. But in bulk they are a conductive material. We haven't refined the process to the point where we can select for conductivity type yet.