There are a number of promising conductive technologies for printed electronics (PE). Typically, conductive metals and silicon-based inks have been most commonly utilized, but other approaches, notably carbon-based inks, have strong advantages as well. In particular, carbon nanotubes (CNT) offer numerous advantages to PE manufacturers and designers. Single-wall carbon nanotubes consist of a hollow cylinder of carbon ~ 1nm in diameter, up to 1,000 times as long as it is wide. This structure has remarkable optical and electronic properties, excellent strength and flexibility, and high thermal and chemical stability. In addition, CNTs allow developers to provide a very specific functionality for a surface, and can be transparent. However, there have also been drawbacks to CNT technology. It is difficult to produce CNTs at a competitive cost, and there are ease of handling and safety issues, particularly when utilizing CNT powders. That is wher