Chemical Vapor Synthesis and Characterization of Manganese Oxides

Manganese oxide nanoparticles are synthesized by a chemical vapor process using manganese(0) carbonyl as the precursor. The synthesis temperature of the materials is varied from 500 to 1500 °C at 200 °C intervals. These nanomaterials are characterized by X‐ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer‐Emmett‐Teller (BET) surface area, and X‐ray photoelectron spectroscopy (XPS). XRD shows that the manganese oxide nanoparticles synthesized at 500, 700 – 1100, 1300, and 1500 °C are mainly MnO2, Mn2O3, Mn2O3/Mn3O4, and Mn3O4, respectively. The TEM and BET results also confirm that the particle size is on the nanometer scale with a large specific surface area (SSA) of 81 – 215 m2 g−1. XPS indicates the catalysts to have manganese oxidation states of (2+), (3+), or (4+) depending on the synthesis temperature. Manganese oxides nanoparticles were synthesized by a chemical vapor process using manganese(0) carbonyl as the precursor. The material synthesis temperatures were varied from 500 to 1500 °C at 200 °C intervals. The physico‐chemical properties of MnOx were analyzed by X‐ray powder diffraction (XRD), transmission electron microscopy (TEM), BET surface area, and X‐ray photoelectron spectroscopy (XPS).