Controlled purification, solubilisation and cutting of carbon nanotubes using phosphomolybdic acid

Abstract

We describe a straight forward procedure that allows an easy purification, an efficient solubilisation and, if desired, a controlled cutting of carbon nanotubes. The method uses aqueous solutions of phosphomolybdic acid combined with ultrasound, leading to the adsorption of phosphomolybdate on the nanotubes. This generates a negative surface charge allowing the formation of very stable suspensions. Prolonged exposure results in a controlled shortening of the tubes. Single- as well as multi-wall carbon nanotubes can be treated this way, which facilitates their further processing.