Synthesis and characterizations of Eu2O3 nanocrystallites and its effect on optical investigations of Eu3+, Eu2+: SiO2 nanopowder

Ahlawat, Rachna; Rani, Neelam; Goswami, Bindiya

doi:10.1016/j.jallcom.2018.01.360

Cited by 24 publications

(4 citation statements)

References 26 publications

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“…It can be seen clearly that two sharp peaks at 3,567 cm −1 and 3,672 cm −1 could be attributed to the structural O–H stretching vibrations 21 , 22 confirming the presence of the protonated species in the sample. A very broad band in a range from 2,700 cm −1 to 3,450 cm −1 suggests the presence of adsorbed water molecules on hydroxyl groups on the surface, 22 , 23 , 24 which is common in metal oxide with high surface area and high reactivity, showing a significant impact on its chemical and physical properties, such as its catalytic activity and surface charge. Another peak at 1,622 cm −1 or 1,573 cm −1 is assigned to the bending mode of H-OH adsorbed on surface.…”

Section: Resultsmentioning

confidence: 99%

“…Another peak at 1,622 cm −1 or 1,573 cm −1 is assigned to the bending mode of H-OH adsorbed on surface. 24 And two strong peaks at 1,488 and 1,394 cm −1 are possibly due to the oxygen ions' stretching vibrations and the bending mode of O-H. 25 , 26 When protons are injected into the lattice and interact with oxygen ions, the vibrational frequency of oxygen ions changes, making the double peaks degenerate and shift to a single peak with a shoulder. And the bands at around 686 cm −1 are assigned to the bend vibration of Eu- O -H. 27 Other signals at 1,065 cm −1 , 1,003 cm −1 , and 857 cm −1 may be assigned to C-O, C-H, and CH 2 , due to Eu2O3 easily absorbing carbon dioxide from the environment.…”

Section: Resultsmentioning

confidence: 99%

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Exceptionally high proton conductivity in Eu2O3 by proton-coupled electron transfer mechanism

Wan,

Shah,

Wang

et al. 2024

iScience

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Exceptionally high proton conductivity in Eu2O3 by proton-coupled electron transfer mechanism

Wan,

Shah,

Wang

et al. 2024

iScience

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“…Additionally, we undertook the deposition of both elements onto a nanosilica surface (fumed silica with a specific surface area S BET > 300 m 2 /g) for controlling the size of the nanoparticles. Furthermore, optical and mechanical neutrality alongside the availability of the entire surface on fumed SiO 2 allowed the crystalline phases of Gd 3+ or Eu 3+ to be uniformly distributed over the inert template, maintaining the pure optical property characteristics of both REE crystalline phases [20]. The impregnation of the nanosilica with REE salts and the application of such a hybrid system in PDT is an innovative step.…”

Section: Introductionmentioning

confidence: 99%

Novel Scintillating Nanoparticles for Potential Application in Photodynamic Cancer Therapy

et al. 2022

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The development of X-ray-absorbing scintillating nanoparticles is of high interest for solving the short penetration depth problem of visible and infrared light in photodynamic therapy (PDT). Thus, these nanoparticles are considered a promising treatment for several types of cancer. Herein, gadolinium oxide nanoparticles doped with europium ions (Gd2O3:Eu3+) were obtained by using polyvinyl alcohol as a capping agent. Hybrid silica nanoparticles decorated with europium-doped gadolinium oxide (SiO2-Gd2O3:Eu3+) were also prepared through the impregnation method. The synthesized nanoparticles were structurally characterized and tested to analyze their biocompatibility. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy confirmed the high crystallinity and purity of the Gd2O3:Eu3+ particles and the homogeneous distribution of nanostructured rare earth oxides throughout the fumed silica matrix for SiO2-Gd2O3:Eu3+. Both nanoparticles displayed stable negative ζ-potentials. The photoluminescence properties of the materials were obtained using a Xe lamp as an excitation source, and they exhibited characteristic Eu3+ bands, including at 610 nm, which is the most intense transition band of this ion. Cytotoxicity studies on mouse glioblastoma GL261 cells indicated that these materials appear to be nontoxic from 10 to 500 μg·mL−1 and show a small reduction in viability in non-tumor cell lines. All these findings demonstrate their possible use as alternative materials in PDT.

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“…The types of luminescent derivatives of Eu(II) are quite diverse. They include unsolvated EuI 2 , , solvated dihalides EuCl 2 (THF) 2 , the borohydride Eu(BH 4 ) 2 (THF) 2 , compounds containing bulky (4- n Bu-C 6 H 4 ) 5 -cyclopentadienyl, aza-222 cryptate, hydrotris(pyrazolyl)borate, pentaphenylcyclopentadienyl, and silylamide ligands, and an imidazolate metal–organic framework as well as various inorganic matrices doped with Eu 2+ ions. − …”

Section: Introductionmentioning

confidence: 99%

Unexpected Findings in a Simple Metathesis Reaction of Europium and Ytterbium Diiodides with Perfluorinated Mercaptobenzothiazolates of Alkali Metals

et al. 2020

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In the search for new f–d luminescent complexes of Eu(II) and Yb(II) the metathesis reactions of diiodides of these metals with perfluorinated 2-mercaptobenzothiazolates of alkali metals were studied. It has been found that the reactions of LnI2(THF)2 (Ln = Eu, Yb) with K(mbtF) (mbtF = perfluorinated 2-mercaptobenzothiazolate anion) in DME result in the formation of the nonluminescent complexes Ln(mbtF)2(DME)2 and precipitation of KI in high yields. Single-crystal X-ray diffraction analyses have shown that Eu(mbtF)2(DME)2 has a trans orientation of mbtF ligands, while in the Yb(mbtF)2(DME)2 molecule the ligands occupy cis positions. The DFT calculations and estimations with the invariom model revealed that the complexes have a flexible coordination sphere of Ln2+ ions and a relatively low energy of Ln–mbtF binding. The reactions of the same diiodides with the lithium complex Li(mbtF) are reversible and proceed through the formation of intermediate complexes of unknown structure which have been isolated as noncrystalline solids. The europium product (solid and in DME solution) upon UV excitation exhibited bright luminescence with λ 510 nm. Data from time-resolved photoluminescence (PL) spectroscopy indicated the existence in the intermediate substance of two Eu2+ emission centers with different coordinating environments. Treatment of the solid intermediate product with toluene led to its dissociation onto Ln(mbtF)2(DME)2 and [LiI(DME)] n . The back-replacement of toluene with DME gives again the solutions from which the starting LnI2 and Li(mbtF)(DME) were precipitated by slow evaporation of the solvent. The reversibility of the processes has been confirmed by the reaction of nonluminescent Eu(mbtF)2(DME)2 with LiI in DME medium, which resulted in the same luminescent solution which gave a mixture of EuI2(DME)3 and Li(mbtF).

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Synthesis and characterizations of Eu2O3 nanocrystallites and its effect on optical investigations of Eu3+, Eu2+: SiO2 nanopowder

Cited by 24 publications

References 26 publications

Exceptionally high proton conductivity in Eu2O3 by proton-coupled electron transfer mechanism

Exceptionally high proton conductivity in Eu2O3 by proton-coupled electron transfer mechanism

Novel Scintillating Nanoparticles for Potential Application in Photodynamic Cancer Therapy

Unexpected Findings in a Simple Metathesis Reaction of Europium and Ytterbium Diiodides with Perfluorinated Mercaptobenzothiazolates of Alkali Metals

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