Synthesis, Structural and Optical Characteristics of Vanadium Doped Cerium Dioxide Layers

El-Habib, Abdellatif; Addou, M.; Aouni, A.; Diani, Mustapha; Zimou, J.; Bakkali, Hicham

doi:10.2139/ssrn.3790082

Cited by 1 publication

(1 citation statement)

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“…The size difference between Ce 3+ (r = 1.034 Å) and Ce 4+ (r = 0.92 Å) could induce strain in the lattice caused by local symmetry distortion, thus increasing in lattice parameter due to Ce 3+ formation. 16,17) Meanwhile, the lattice parameter from Rietveld refinement shows lattice shrinking for both Ag-doped and Nidoped Ce. Lattice parameter deviation of Rietveld refinement from Vegard's law calculation could be due to oxygen vacancy and interstitial formation in the matrix.…”

Section: Discussionmentioning

confidence: 99%

Effect of Ag and Ni-Doped Cerium Oxide Nanoparticles on the Formation of ROS and Evaluation as an Alternative Physical Sunscreen Material

Marsius,

Hidayat,

Adhika

et al. 2024

CHEMICAL & PHARMACEUTICAL BULLETIN

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CeO 2 nanoparticles (nanoceria) were proposed as an alternative physical sunscreen agent with antioxidant properties and comparable UV absorption performance. Green synthesis of nanoceria with Ag and Ni dopants resulted in doped nanoceria with lower catalytic activity and biologically-safe characteristics. The doped nanoceria was characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Rancimat Instrument, and UV-Vis Spectrophotometer for SPF (Sun Protection Factor) determination. XRD and TEM analysis showed that nanoceria had been successfully formed in nanoscale-sized with a change in crystallite size due to the crystal defect phenomenon caused by dopant addition. While the Rancimat test and band gap energy analysis were conducted to evaluate the oxidative stability and reactive oxygen species formation, it was confirmed that dopant addition could decrease catalytic activity of material, resulting in Ni-doped Ce with a longer incubation time (11.81 h) than Ag-doped Ce (10.58 h) and non-doped Ce (10.30 h). In-vitro SPF value was measured using the thin layer technique of sunscreen prototype with Virgin Coconut Oil (VCO)-based emulsion, which yielded 10.862 and 5.728 SPF values for 10% Ag-doped Ce and 10% Nidoped Ce, respectively. The dopant addition of nanoceria could reduce catalytic activity and give a decent in vitro UV-shielding performance test; thus, Ag and Ni-doped nanoceria could be seen as promising candidates for alternative physical sunscreen agents.

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Section: Discussionmentioning

confidence: 99%