CeO2 nanoparticles growth by chemical bath and its thermal annealing treatment in air atmosphere

• DOI: 10.1016/j.ijleo.2017.08.133
• Publication Date: 2017-08-31T17:05:57Z
• Authors: O. Portillo Moreno; R. Gutiérrez Pérez; R. Palomino Merino; M. Chávez Portillo; G. Hernandez Tellez; E. Rubio Rosas; M. Zamora Tototzi...
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Abstract A novel synthesis of CeO2 powder by using chemical bath (CB) as green method is presented. The process was completed by thermal annealing (TA) at 1000 °C during 2 h. CeO2 growth was confirmed by: X-ray diffraction (XRD), UV–vis spectra, Energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) and Raman spectra. By FTIR, bands associated with C O 3 2 − and OH− ions were identified, disappearing with the TA process. The X-ray diffraction (XRD) patterns of the as grown and CeO2 TA samples showed the reflection characteristic of CeO2 structure with a cubic symmetric pattern. By XRD diffractograms the grain size calculated were ∼2.7 nm and ∼28.5 nm for as-grown and CeO2 TA samples, respectively. The grain size of ∼2.7 nm is the smallest among the reported values for CeO2. Absorbance of as-grown spectra showed three bands located at ∼382, ∼357 and ∼271 nm while the CeO2 TA sample displayed only two bands at ∼271 and ∼320 nm. Direct optical energy gap were Eg = 4.4 eV and Eg = 4.3 eV for as-grown and CeO2 TA samples, respectively, showing quantum size effect of CeO2 nanoparticles. Raman spectra indicated that the as-grown and CeO2 samples have the fluorite structure.