Synthesis of c-MnOOH nanorods and their isomorphous transformation into b-MnO2 and a-Mn2O3 nanorods

c-MnOOH nanorods with different diameters were synthesized by a simple one-step polymer-assisted hydrothermal method using 50% (wt.%) Mn(NO3)2 solution and PEG-10000 as reagents. The diameters of assynthesized c-MnOOH nanorods were well controlled by simply varying the volume of the 50% Mn(NO3)2 solution. The calcination behavior of the as-synthesized c-MnOOH nanorods was studied. Nanorods of b-MnO2 and a-Mn2O3 were synthesized by calcination at 350 and 600 C for 1 h respectively.