Study on UV Absorption Characteristics of Multi-shape Nano-cerium Oxide
In this work, Cerium oxide in the shape of nano-rod and nano-cubic were synthesized by hydrothermal synthesis and cerium oxide in the shape of nano-particle were synthesized by coprecipitation method to study UV absorption characteristics of multi-shape nano-cerium oxide. The effects of different precipitants (urea or ammonia or sodium hydroxide) and different contents of cerium nitrate on the morphology, microstructure and ultraviolet absorption properties of nanocerium oxide were studied. Research indicates, the microstructure of nano-cerium oxide with various morphologies were cubic fluorite. When the concentration of precipitants was 0.2175g/ml, the hydrothermal reaction temperature was at 140 ℃, reaction time was in 5 hours, and the calcination temperature was at 450℃, cerium oxide in the shape of nano-rod was uniform distribution, the size was proper and UV absorption was the best. When the Ce (NO3) 3 concentration was 0.6mol/l, the hydrothermal reaction temperature was at 160 ℃, reaction time was in 24 hours, and the calcination temperature was at 450℃, cerium oxide in the shape of nano-cubic was evenly distributed, the size was proper and the ultraviolet absorption was the best. When the concentration of Ce (NO3) 3 was 0.4mol/l, the bath temperature was at 140 ℃, the dry temperature was at 80℃ and the calcination temperature was at 450℃, the dry time was in 2 hours, the calcination time was in 2 hours, cerium oxide in in the shape of nano-particles was evenly distributed, the size was proper and the UV absorption was the best. Conclusion: the morphology of cerium oxide in the shape of nano-particles was the best and the uv absorption performance of cerium oxide in shape of nano-cubic was best among the three shapes of nano-cerium oxide.