Synthesis and Formation Mechanism of Manganese Dioxide Nanowires/Nanorods

Abstract

α‐, β‐, γ‐, and δ‐MnO 2 single‐crystal nanowires/nanorods with different aspect ratios have been successfully prepared by a common hydrothermal method based on the redox reactions of MnO 4− and/or Mn 2+. The influences of oxidant, temperature, and inorganic cation (NH 4+ and K+) template concentrations on the morphology and crystallographic forms of the final products are discussed in this paper. It is interesting to find that all the MnO 2 one‐dimensional nanostructures have a similar formation process: δ‐MnO 2, which has a layer structure, serves as an important intermediate to other forms of MnO 2, and is believed to be responsible for the initial formation of MnO 2 one‐dimensional nanostructures. A rolling mechanism has been proposed based on the results of the series of TEM images and XRD patterns of the intermediate.