Controlled Synthesis of Manganese Dioxide Nanostructures via a Facile Hydrothermal Route

[摘要] Manganese dioxide nanostructures with controllable morphological structures and crystalline phases were synthesized via a facile hydrothermal route at low temperatures without using any templates or surfactants. Both the aging duration and aging temperatures were the main synthesis parameters used to influence and control the rate of morphological and structural evolution of MnO2nanostructures. MnO2nanostructures comprise of spherical nanoparticulate agglomerates and highly amorphous in nature were formed at lower temperature and/or short aging duration. In contrast, MnO2nanostructures of sea-urchin-like and nanorods-like morphologies and nanocrystalline in nature were prepared at the combined higher aging temperatures and longer aging durations. These nanostructures underwent notable phase transformation fromδ-MnO2toα-MnO2upon prolonged hydrothermal aging duration and exhibited accelerated rate of phase transformation at higher aging temperature.

[学科分类] 材料工程