Abstract
Cerium oxide (\({\hbox {CeO}}_{2{-}x}\)) nanoparticles or nanoceria were synthesized by the chemical co-precipitation method using cerium nitrate hexahydrate and ammonium carbonate as starting materials and deoxyribonucleic acid (DNA) as a capping agent. The structural and optical characterization of the prepared nanoparticles was studied in depth by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy, Raman spectroscopy, UV–visible absorption and diffuse reflectance spectroscopy. The average crystallite size and lattice parameters of the cerium oxide nanoparticles at different calcination temperatures were studied using XRD analysis. The average crystallite size was found to be 6 nm and the size increases with calcination temperature. The polycrystalline nature and the size of the particles obtained are in close agreement with HRTEM and Raman analysis. The optical band gaps of all samples were measured by Tauc plot which showed a blue shift with a decrease in size due to the quantum confinement effect. The optical absorption spectrum of the synthesized nanoparticles showed the absorption of UVA, UVB and UVC light, and the variation in structural and optical properties with size makes them suitable for the optoelectronic application. To the best of our knowledge, this is the first report on using DNA in the synthesis of nanostructured ceria.
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The authors acknowledge SAIF, Cochin and CLIF University of Kerala for providing facilities for characterization.
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Jyothi, P.S.P., Anitha, B., Smitha, S. et al. DNA-assisted synthesis of nanoceria, its size dependent structural and optical properties for optoelectronic applications. Bull Mater Sci 43, 119 (2020). https://doi.org/10.1007/s12034-020-02102-w
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DOI: https://doi.org/10.1007/s12034-020-02102-w