Synthesis and characterization of CeO2 nano particles

Abstract

In this paper, we have synthesized the Cerium oxide Nanoparticles (Ceria NPs) by Co precipitation (CPT) method using Cerium tri -nitrate hexahydrate and also potassium carbonate solutions. Then synthesized precipitate was heated at 70˚C for 20 hour. Slow grinding of the precipitate and calcined for 3 hours at different temperatures viz. 700° C, 850° C to form fine Cerium oxide powder-Ceria NPs. The characterization of Ceria NPs calcined at temperatures viz 700° C, 850° C have been done through X-ray diffraction and Raman Analysis. EDS, Scanning Electron Microscopy (SEM), The X-Ray diffraction pattern shows the nature of the Ceria NPs crystal, with a cubic structure and lattice parameters 5.392 Å for samples calcined at temperature of 700° C and 5.357 Å at 850° C which shows decreasing trend in lattice parameter with calcination temperature. The intensity of Raman peaks is shifted upwards with a rise in temperature. This intensity difference could be because of the rise in vibrational amplitudes of the closest neighboring bonds because of the increase in particle size 11.3 ± 1.0 to 15.6 ± 1.0 nm calcination temperatures at 700° C and 850° C and therefore the Raman peak of peak I, 461 cm−1& peak II, 463 cm−1 respectively. Other peaks were not observed in this Raman pattern. The EDS analysis confirms the presence of the Ce and O atoms in the synthesized samples. The morphology and microstructures were studied using SEM analysis. Spherical shapes and homogeneously distributed Ceria NPs and a rather tendency for agglomeration were confirmed.