Fabrication of MnO2 nanostructures and study of their structural and dielectric properties

In this study, one-dimensional MnO2 nanostructures such as nanorods, nanotubes, and nanowires have been synthesized by the hydrothermal method. MnO2 nanostructures have been characterized by x-ray diffraction, Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and meter LCR.The results of the XRD show that MnO2 nanostructures are single phase. Also, the SEM images well shows the nanostructures such as nanorods, nanotubes, and nanowires have been formed. The LCR meter results show that the dielectric constant and dielectric loss at the low frequencies are due to high electrical resistance at the grains boundaries while at the high frequencies are due to small electrical resistance at the grains with electrical resistance is low. The ac electric conductivity of the -MnO2 nanostructures by increasing frequency, have been increased that this increase are due to the hopping process between 〖Mn〗^(3+)/〖Mn〗^(4+).