Investigation of activated oxygen molecules on the surface of Y2O3 nanocrystals by Raman scattering

Xu, Jun; Xiong, Shi‐Jie; Wu, Xiaohong; Li, T. H.; Jin, Shangtai; Chu, Paul K.

doi:10.1063/1.4820465

Cited by 30 publications

(7 citation statements)

References 43 publications

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“…Although no structural transition was involved near 8–10 GPa for Y 2 O 3 /Eu 3+ nanotubes, the observations from the Raman vibration and ADXD data under high pressure are still related to changes in micro atom‐arrangements. Considering that Raman vibration mode at 378 cm −1 is from the contribution of Y 3+ –O 2− vibration, the vibration represents the deformation information of the YO 6 octahedra , and the YO 6 octahedra of Y 2 O 3 /Eu 3+ nanotubes are deformed in disorder near 8.2 GPa. Thus, we conclude that the deformation of the YO 6 octahedra is responsible for the behavioral changes determined by the Raman vibration and ADXD data.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the lattice behavior of cubic Y₂O₃/Eu³⁺ nanotubes under high pressure

Liu

et al. 2016

Physica Status Solidi (b)

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In situ Raman vibration characterization and angle-dispersive X-ray diffraction (ADXD) measurements were performed on Y 2 O 3 /Eu 3þ nanotubes to study its lattice change behavior under high pressure. The Raman vibration and lattice reflection both show changes in behavior near 8-10 GPa. The lattice of the cubic structure of Y 2 O 3 /Eu 3þ nanotubes exhibits two different lattice states related to forms of the micro local atom arrangement. The lattice states resulted from the local disorder of the lattice due to pressure-induced deformation of the YO 6 octahedra under the high pressure.

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Section: Resultsmentioning

confidence: 99%

Investigation of the lattice behavior of cubic Y₂O₃/Eu³⁺ nanotubes under high pressure

Liu

et al. 2016

Physica Status Solidi (b)

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“…Two absorption peaks one at~252 nm and other at~295 nm are recorded. The~252 nm absorption is attributed to band gap of Y 2 O 3 [3] and 295 nm absorption is attributed to surface traps/defect states. The optical band gap energy (E g ) is estimated using Wood and Tauc relation [34] i.e., (αhν) = K (hν − E g ) 1/n , where 'hν' is the photon energy, 'α' is the optical absorption coefficient, 'K' is constant and 'n' is dependent on the optical transition with an assigned value of 2 and 1/2 for direct allowed and indirect allowed transitions respectively.…”

Section: Uv-visible Spectramentioning

confidence: 99%

“…The materials on such scale have attracted many researchers in various fields of material science, biological science, etc. [2,3]. Currently the importance of nanomaterials in the field of luminescence has been increased.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Shivaramu

Lakshminarasappa

Nagabhushana

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Nanocrystalline Y 2 O 3 is synthesized by solution combustion technique using urea and glycine as fuels. X-ray diffraction (XRD) pattern of as prepared sample shows amorphous nature while annealed samples show cubic nature. The average crystallite size is calculated using Scherrer's formula and is found to be in the range 14-30 nm for samples synthesized using urea and 15-20 nm for samples synthesized using glycine respectively. Field emission scanning electron microscopy (FE-SEM) image of 1173 K annealed Y 2 O 3 samples show well separated spherical shape particles and the average particle size is found to be in the range 28-35 nm. Fourier transformed infrared (FTIR) and Raman spectroscopy reveals a stretching of Y-O bond. Electron spin resonance (ESR) shows V − center, O 2 − and Y 2+ defects. A broad photoluminescence (PL) emission with peak at~386 nm is observed when the sample is excited with 252 nm. Thermoluminescence (TL) properties of γ-irradiated Y 2 O 3 nanopowder are studied at a heating rate of 5 K s −1 . The samples prepared by using urea show a prominent and well resolved peak at~383 K and a weak one at~570 K. It is also found that TL glow peak intensity (I m1 ) at~383 K increases with increase in γ-dose up to~6.0 kGy and then decreases with increase in dose. However, glycine used Y 2 O 3 shows a prominent TL glow with peaks at 396 K and 590 K. Among the fuels, urea used Y 2 O 3 shows simple and well resolved TL glows. This might be due to fuel and hence particle size effect. The kinetic parameters are calculated by Chen's glow curve peak shape method and results are discussed in detail.

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“…3, and the respective assignments are summarized in Table II. Y 2 O 3 nanotubes Raman spectrum is dominated by F g mode at 376 cm À1 rising from Y 3þ -O 2À vibration. 19 According to the most recent attributions, we identify the F g modes at 468 and 592 cm À1 . 20 Furthermore, adjacent to the most intense contribution, we recognise two not completely resolved vibrations at 329 and 429 cm À1 attributed to F g þ E g and A g modes, respectively.…”

Section: Resultsmentioning

confidence: 99%

Luminescence enhancement by energy transfer in melamine-Y2O3:Tb3+ nanohybrids

Stagi

Chiriu

Ardu

et al. 2015

Journal of Applied Physics

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The phenomenon of luminescence enhancement was studied in melamine-Y2O3:Tb hybrids. Terbium doped Y2O3 mesoporous nanowires were synthesized by hydrothermal method. X-ray diffraction patterns and Raman scattering spectra testified the realization of a cubic crystal phase. Organic-inorganic melamine-Y2O3:Tb3+ hybrid system was successfully obtained by vapour deposition method. Vibration Raman active modes of the organic counterpart were investigated in order to verify the achievement of hybrid system. Photoluminescence excitation and photoluminescence spectra, preformed in the region between 250 and 350 nm, suggest a strong interaction among melamine and Terbium ions. In particular, a remarkable improvement of 5D4→ FJ Rare Earth emission (at about 542 nm) of about 102 fold was observed and attributed to an efficient organic-Tb energy transfer. The energy transfer mechanism was studied by the use of time resolved photoluminescence measurements. The melamine lifetime undergoes to a significant decrease when adsorbed to oxide surfaces and it was connected to a sensitization mechanism. The detailed analysis of time decay profile of Terbium radiative recombination shows a variation of double exponential law toward a single exponential one. Its correlation with surface defects and non-radiative recombination was thus discussed

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Investigation of activated oxygen molecules on the surface of Y2O3 nanocrystals by Raman scattering

Abstract: Articles you may be interested inSilicon nanocrystals with high boron and phosphorus concentration hydrophilic shell-Raman scattering and Xray photoelectron spectroscopic studies

Cited by 30 publications

References 43 publications

Investigation of the lattice behavior of cubic Y₂O₃/Eu³⁺ nanotubes under high pressure

Investigation of the lattice behavior of cubic Y₂O₃/Eu³⁺ nanotubes under high pressure

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Luminescence enhancement by energy transfer in melamine-Y2O3:Tb3+ nanohybrids

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Investigation of activated oxygen molecules on the surface of Y2O3 nanocrystals by Raman scattering

Abstract: Articles you may be interested inSilicon nanocrystals with high boron and phosphorus concentration hydrophilic shell-Raman scattering and Xray photoelectron spectroscopic studies

Cited by 30 publications

References 43 publications

Investigation of the lattice behavior of cubic Y2O3/Eu3+ nanotubes under high pressure

Investigation of the lattice behavior of cubic Y2O3/Eu3+ nanotubes under high pressure

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Luminescence enhancement by energy transfer in melamine-Y2O3:Tb3+ nanohybrids

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Investigation of the lattice behavior of cubic Y₂O₃/Eu³⁺ nanotubes under high pressure

Investigation of the lattice behavior of cubic Y₂O₃/Eu³⁺ nanotubes under high pressure