Synthesis and Characterization of Lanthanum Oxide Nanoparticles from Thermolysis of Nano-sized Lanthanum(Ⅲ) Supramolecule as a Novel Precursor

摘要

A new nano-sized La(Ⅲ) supramolecular compound, [pyda.H]_2[La_2(pydc)_4(H_2O)_4]·2H_2O (1), where [pyda.H]~+ = 2,6-diaminopyridinium, and [pydc]~(2-) = 2,6-pyridinedicarboxylate, was synthesized by the sonochem-ical method and characterized by field emission scanning electron microscope (FESEM), X-ray powder diffraction (XRD) and elemental analyses. Lanthanum oxide nanoparticles were prepared by direct thermal decomposition of 1 nanostructures in a programmable furnace up to 800 ℃ in ambient atmosphere. The structural characterization was performed by powder XRD; and, morphological observations by FESEM revealed that the quasi-spherical La_2O_3 nanoparticles obtained are well crystallized and uniform in both morphology and particle size. The study demonstrates that supramolecular compounds may be suitable precursors for the simple one-pot preparation of nanoscale metal oxide materials with different morphologies.