Morphological analysis of ultra fine {α}-MnO2 nanowires under different reaction conditions

A simple hydrothermal method was developed for the synthesis of ultra fine single-crystal {\alpha}-MnO2 nanowires by only using potassium permanganate and sodium nitrite in acidic solution, without any seed or template. Detailed analysis of the obtained nanowires was done using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and high resolution transmission electron microscopy (HRTEM) measurements. The as-prepared {\alpha}-MnO2 nanowires have the average diameter of 10-40nm and a length up to 0.1 to 2{\mu}m. Moreover, the effects of reaction temperature, time and reactant molar ratios on the morphology of the final product were studied in detail using field emission scanning electron microscopy (FESEM) measurements.