Large-scale synthesis of Mn11(HPO3)8(OH)6 superstructures constructed by microrods via a mixed-solvothermal route

In this paper, we reported the successful synthesis of hollow hemispherical Mn11(HPO3)8(OH)6 superstructures on a large scale via a facile mixed-solvothermal route without assistance of any surfactant, employing MnAc2·4H2O and NaH2PO2·H2O as the reactants, the mixture of N,N-dimethylformamide (DMF) and water as the solvent. The reaction was carried out at 160 °C for 12 h. HPO32− ions were provided via the dismutation reaction of H2PO2− ions. The as-obtained product was characterized by X-ray powder diffraction (XRD), energy dispersive spectrometry (EDS) and field emission scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Some factors influencing the morphology of the hollow hemispherical Mn11(HPO3)8(OH)6 superstructures, such as the reaction temperature, time, the amount of NaH2PO2, and the volume ratio of DMF/water, were systematically investigated. A possible growth mechanism was proposed based on experimental results.