Abstract
Cerium oxide nanoparticles are prepared by simple precipitation method with various precipitants. The prepared samples are analyzed by XRD, FT-IR and PL. XRD confirms the occurrence of single-phase polycrystalline cubic fluorite structure with dominant orientation along (111) direction. The sharp band at 1415 cm-1 originated from –CH3 deformation and –CH2 scissoring vibrations of PVP, also A strong band at 848 and 400 cm-1 due to the envelope of the phonon band of the metal oxide (Ce-O) network obtained from FT-IR spectra. PL spectra exhibit the presence of strong blue and weak blue-green emission in the visible region. Additions of PVP strongly distress the peaks intensity of the samples.
Highlights
With the increasing global demand for low cost solar cells are being scalable to high power level, transition metal oxides (TMO) semiconductors started to be considered as a promising material for such applications [1]
Assimilation of PVP strongly increases the transmittance of the samples prepared from KOH precipitant, whereas moderately increases the same prepared from NaOH precipitant but slightly increases the same prepared from NH3 precipitant
Cubic fluorite structure of single-phase polycrystalline CeO2 crystallites is detected from XRD pattern, while the presence of tetravalent Ce4+ is evident from the PL spectra
Summary
With the increasing global demand for low cost solar cells are being scalable to high power level, transition metal oxides (TMO) semiconductors started to be considered as a promising material for such applications [1]. Among the pervasive preparation methods, the homogeneous precipitation method has received much attention due to its inherent advantages like simple, low cost and highly consistent process without introducing impurity elements to prepare nanoparticles. An attempt has been made to synthesize rare earth materials like cerium oxide nanoparticles. Cerium oxide nanoparticles are prepared by precipitation method as reported in elsewhere [9]. Cerium oxide nanoparticles are prepared using cerium nitrate, aqueous ammonia, potassium hydroxide, sodium hydroxide and PVP purchased from HIMEDIA, Mumbai and used without further purification. 0.1 M of cerium nitrate hexahydrate (Ce(NO3)3.6H2O) is dissolved in 50 ml of de-ionized water and strongly stirred for 30 min, 25 ml of aqueous ammonia (NH3) solution is added drop-wise to the above solution for 20 min and persistently stirred for 12h at room temperature. Interesting color changes appeared in the solution when precipitant (NH3) was added to cerium nitrate solution. The PVP is added to the above precursor solutions to observe the morphological changes
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