When single-walled carbon nanotubes are made, a mixture of both metallic and semiconducting nanotubes is produced. This is a problem when trying to make electronic devices from these nanomaterials because, ideally, either semiconducting or metallic tubes are needed depending on the application and not both. Now, researchers in the US have found that a polymer sorting technique in solvents can not only be used to separate the two types of tubes but that some solvents are more compatible with ink-jet processes for making printed electronics devices, such as transistors………….
http://nanotechweb.org/cws/article/tech/60117
