Synthesis and characterization of whisker-shaped MnO2 nanostructure at room temperature

Abstract

Manganese dioxide nanoparticles have been synthesized, via a facile one-step solution phase approach, by the reduction of potassium permanganate with sodium thiosulphate at room temperature. Upon addition of thiosulphate to the solution of permanganate, a transparent dark-brown color species appeared which was stable for several months. The obtained MnO2 solution was characterized by means of UV–vis spectra, Transmission electron microscopy (TEM), and Fourier transforms infrared spectroscopy. Fourier transforms infrared spectroscopy spectra of pure MnO2 show the occurrence of O–Mn–O vibrational mode at around 600 and 475 cm−1. The chemical composition was obtained by EDX analysis and confirmed the presence of Mn and O in the sample. From the TEM image, the surface morphology of the sample shows uniformly dispersed particles, which are spherical in shape. The selected area electron diffraction patterns revealed that the MnO2 are crystalline in nature.