Observation of a Double Maximum in the Dependence of Conductivity on Oxidation State in Potassium Fulleride Nanowires Supported by a Mesoporous Niobium Oxide Host Lattice



Non-stoichiometric potassium fulleride nanowires, KnC60, intercalated into the pores of mesoporous niobium oxide (see Figure), show conductivity maxima that are different from those of bulk fullerides. An interesting result that is attributed to an electronic transition in the material to a cooperative state, in which the structure is no longer acting as a one- dimensional system, is obtained at n = 4.1.