Controllable Synthesis And Characterization Of Novel Manganse Oxide Nanostrucutres

Manganese oxides, as a kind of low cost, environmental friendly, rich sources, and special structure material, have a widely potential value in different application field, such as super capacitors, catalysts, batteries, electronics, and optoelectronics. The same species of manganese oxides prepared by different synthetic methods will be different in the morphology and the crystalline, which will significantly affect their properties and uses. Nowadays, the novel preparation methods to prepare manganese oxides with special morphology have become hotspots. In this work, several manganese oxides with different shape were successfully fabricated through hydrothermal method, the main results summarized are listed as follows:(1) The y-MnOOH networks were successfully synthesized using H2O2and Mn(NO3)2in the presence of urea for the first time. The reaction time, the reaction temperature, H2O2amount and urea amount were identified on the effect of morphology and structure. The synthesized samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Moreover, a plausible mechanism has been proposed to describe the formation of the y-MnOOH networks.(2) Another y-MnOOH networks which were different from (1) above were prepared through mixed solvent H2O and C2H5OH in the presence of Mn(NO3)2and urea. The as-prepared y-MnOOH was calcined to form β-MnO2without changing the precursor morphologies.(3) The rose-like y-MnOOH, multi-branched y-MnOOH and Mn2O3bowl were prepared through solvothermal method in different organic solvent. Meanwhile, Mn2O3cube was prepared via one-pot hydrothermal synthesis via H2O2and Mn(NO3)2in the presence of urea.In this work, several manganese oxides with different morphology and structure were prepared through various controllable synthesis methods. The new structures presented enrich the nanoscale community and offer a new approach for increasing structural complexity and enabling greater potential applications.