A facile route to synthesize uniform single-crystalline α-MnO2 nanowires

Single-crystalline α-MnO2 nanowires with diameters of 10-30 nm and lengths ranging from 6 to 10 μm have been successfully synthesized by hydrothermal treating a mixed solution of KMnO4 and NH4Cl at 140 °C for 24 h. The final products were characterized by XRD, FESEM, TEM and HRTEM. The effect of anion Cl− in the possible rolling formation mechanism was also briefly discussed.