Highly water soluble multi-layer graphene nanoribbons and related honey-comb carbon nanostructures.

Multi-layer graphene nanoribbons have been made highly water soluble (4.7 mg ml(-1)) and stable for the first time by repetitious derivatization with p-carboxyphenyldiazonium salt; similarly, single-walled carbon nanotubes (4.8 mg ml(-1)) and ultra-short carbon nanotubes (50 mg ml(-1)) can also be made highly soluble by the methodology.