Preparation of carbon nanotubes as pure substances could benefit from a new way to make gram amounts of “nanohoops” (Chem. Sci., DOI:10.1039/c2sc20719b).
Nanohoops—or cycloparaphenylenes (CPPs)—are like bracelets made from para-linked benzene rings. Stacking of CPPs could be the basis for preparing useful quantities of pure carbon nanotubes.
J. Am. Chem. Soc., DOI: 10.1021/ja807126u).
But the catalysts they used weren’t ideal, and yields of CPPs were low. CPPs have remained so difficult to make that they are currently sold commercially for about $100 per