Preparation of 7-MnO_2 Thin Film and Its Catalytic Property

A γ-MnO2 thin film was prepared using nano-sized γ-MnO2 powder by the suspending particles sintering method. The γ-MnO2 thin film was characterized by AFM, SEM, BET and XRD techniques, and the effects of La, PVA additives and pH value on the structure of γ-MnO2 thin film were examined. In additim, catalytic properties ofγ-MnO2 thin film and γ-MnO2 nanometer powder were compared by H2-TPR technique. The results show that La can efficiently suppress the phase transformation of γ-MnO2 thin film at La/Mn=0.15, there are no cracks on the surface of γ-MnO2 thin film dipped at pH=10 and PVA/γ-MnO2=7%,and the activity of oxygen center of γ-MnO2 thin film is slightly lower than that ofγ-MnO2 nanometer powder.