The uniform-sized cerium dioxide nanoparticels,nanocubes,and nanorods were synthesized by an inexpensive microwave-assisted method.The shape of the cerium oxide could be controlled simply by varying the irradiation time.The UV-vis spectrum measurements at various reaction time were used to measure the UV absorption of nanostructure CeO2 and track the morphological evolution.It was found that the absorption peak would shift to the higher wavelength when the CeO2 nanocrystals grew from nanoparticles to nanoro...