Controlled synthesis and optical properties of 1D frog egg-like Mn(IO3)2/MnO2 composite nanostructures with ultra-high aspect ratio

The one-dimensional (1D) frog egg-like Mn(IO3)2/MnO2 nanostructures with ultra-high aspect ratio are prepared by reaction of MnCl2·4H2O with KIO3 using a mild hydrothermal method. Tunable shapes, including several three-dimensional structures (grass-, leaf-, and rose-like), can also be obtained by altering experimental conditions. The X-ray powder diffraction (XRD) and energy-dispersive X-ray (EDS) analysis indicate that the products are under a mixed Mn(IO3)2/MnO2 phase. The morphology of the products can be controlled by altering the concentration, reaction time, and temperature. The growth mechanism of the nanostructures is proposed and discussed in detail. The optical properties of the 1D frog egg-like nanostructures are also examined using UV–Vis and photoluminescence (PL) spectrum.

► The 1D frog egg-like Mn(IO3)2/MnO2 nanostructures has been prepared successfully by a simple method. ► Tunable shapes, including several three-dimensional structures (grass-, leaf-, and rose-like) have also been prepared. ► The growth mechanisms of these nanostructures are also surveyed.