Synthesis and characterization of one-dimensional K0.27MnO2·0.5H2O

Potassium manganese oxide (K0.27MnO2·0.5H2O) nanowires/ribbons have been synthesized successfully by a simple hydrothermal method at low temperature. The nanoribbons have rectangular sections with widths of 50-200 nm, thicknesses of 20-25 nm, and lengths up to hundreds of micrometers; nanowires have diameters of 20-30 nm and lengths up to hundreds of micrometers. A plausible formation mechanism of the one-dimensional nanostructure and the effect of the anion effect used for the starting reactants on the product are discussed. Temperature dependence resistivity of one nanowire follows the small polaron theory ρ=ATexp(Ea/kBT), and a small magnetoresistance was observed in the paramagnetic potassium-intercalated manganese oxides.