Physicochemical properties of praseodymium hydroxide and oxide nanorods

摘要

We synthesized hexagonal phase Pr(OH)_3 nanorods by a hydrothermal method and obtained cubic phase Pr_6O_(11) by post-thermal annealing at above 550 °C. Pr(OH)_3 nanorod growth was found to occur in the [001] direction. Upon thermal annealing, the oxidation state of Pr(lll) was changed to Pr(III, IV). The physicochemical properties were fully examined by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) crystallography, UV-Visible-NIR absorption, differential scanning calorimetry/thermogravimetric analysis (DSC/TGA), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction (TPR) and CO oxidation activity tests.