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Monodisperse CeO2 nanocrystals with different morphologies were synthesized from solution-phase thermal decomposition of cerium nitrate by "Heating-Up" process.The obtained samples were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis and different thermal analysis (TGA/DTA), Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible absorption (UV-Vis) spectroscopy.