Hydrothermal soft chemical synthesis of tunnel manganese oxides with Na+ as template

Na+ was used as template in the synthesis of tunnel manganese oxides from a layered manganese oxide under hydrothermal conditions. Two types of tunnel manganese oxides were obtained by the hydrothermal reaction. The manganese oxide with a one-dimensional (2 x 4) tunnel structure formed, under low te mperature conditions, and Na0.44MnO2 with a one-dimension complex tunnel st ructure under high temperature conditions. The mechanism of the transformat ion reaction can be explained from the structures of the products and templ ate size.