metallic and semiconducting species with the potassium salt of coronene tetracarboxylic
acid, I, in an aqueous medium provides a simple method of separating semiconducting and
metallic species. The metallic nanotubes precipitate out on interaction with I while the
semiconducting nanotubes remain in solution. The method avoids centrifugation and is
amenable for large-scale separation and can be used as a routine laboratory procedure …