Properties of Eu doped TiO2 nanoparticles prepared by using organic additives

Leoștean, Cristian; Ştefan, Maria; Panâ, O.; Cadiş, A.I.; Suciu, Ramona-Crina; Silipaş, Teofil-Dănuţ; Gautron, Éric

doi:10.1016/j.jallcom.2013.04.067

Cited by 40 publications

(15 citation statements)

References 54 publications

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“…As expected, a shakedown feature is observed in the 3d doublet XPS spectra of Eu 3? [48][49][50] at around 1124 eV. It is composed of two peaks, S1 and S2 resulting from the final screening observed in our case at 1122.95 and 1127.0 eV, respectively [48].…”

Section: Xpsmentioning

confidence: 50%

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A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

et al. 2015

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The paper presents a simple, reproducible, controllable, and direct wet chemical synthesis method for Zn 1-x Eu x O nanoparticles. The full understanding of decomposition mechanism of the as-obtained oxalate precipitate was achieved based on the thermal analysis correlated with the evolved gas analysis and FTIR spectroscopy. The structure, morphology, and optical luminescent properties of the Zn 1-x Eu x O nanoparticles have been investigated by X-ray diffraction, Raman spectroscopy, HRTEM, SAED, XPS, and PL. The XRD studies reveal the formation of a hexagonal wurtzite-type structure. The presence of Eu 2 O 3 cubic structure can be observed up to 0.5 mol% Eu, suggesting that the solubility of the divalent or trivalent Eu into the ZnO lattice is limited. The formation of Eu 2 O 3 secondary phase at higher Eu concentration is sustained by Raman spectroscopy and XPS, as well. The TEM investigations of the Eu-doped ZnO samples illustrate the presence of aggregates with different shapes and dimensions formed by agglomerated spherical and polyhedral nanoparticles with sizes ranging from 20 to 120 nm. The effect of europium concentration on the structural and morphological characteristics, as well as on the luminescent properties was studied with special emphasis on the europium chemical states-Eu 2? and Eu 3? . The PL measurements sustain the presence of both divalent and trivalent europium ions into the ZnO host lattice and, at the same time, an increase of its defects density induced by the dopant presence.

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Section: Xpsmentioning

confidence: 50%

“…ions. This low intensity emission is due to the fact that most of the energy of the 360 nm excitation photons, being transferred to higher excited electronic states, is lost through ZnO defects by radiative recombinations [50].…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

et al. 2015

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“…26 While, in recent years, lanthanides has been widely investigated due to their electronic, optical, and chemical characteristic arising from 4f electrons. 29 Sadhu et al 30 found that the flat-band potential of La-doped TiO 2 shifted positively and its charge carrier density was also improved. As reported, Nd-doped TiO 2 showed better photocatalytic activity comparing with the blank TiO 2 because of its large surface area, fast separation of electron/hole, and narrower band gap.…”

Section: Introductionmentioning

confidence: 99%

Band edge movement in dye sensitized Sm-doped TiO₂ solar cells: a study by variable temperature spectroelectrochemistry

et al. 2015

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Pure TiO 2 and 8 at.% Sm-doped TiO 2 nanoparticles are prepared via a novel hydrolysis followed by a hydrothermal process at 473 K for 24 h and successfully used into the photoanode of dye sensitized solar cells (DSSCs). The performance of DSSC based on 8 at.% Sm-doped TiO 2 is significantly better compare to DSSC based on undoped TiO 2 . The J sc is 14.53 mA cm -2 and η is 6.78%, which is 15% and 5% higher than that of DSSC based on undoped TiO 2 , respectively. The results of variable temperature spectroelectrochemistry study shows that the conduction band edge of 8 at.% Sm-doped TiO 2 shift positively. The lower conduction band position enhances the driving force of electrons and improves the electron injection efficiency from the lowest unoccupied molecular orbital (LUMO) of the dye to the conduction band (CB) of TiO 2 , and the narrower band gap expands the response in the visible region and increases the utilization percentage of sunlight. These are all contributed to enhanced the performance of cells based on 8 at.% Sm-doped TiO 2 photoanode. The as prepared Sm-doped TiO 2 material is proven in detail to be a better photoanode material than pure TiO 2 .

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“…Sol-gel is one of these methods [4][5][6][7][8][9][10][11][12]. Besides sol-gel method there are many different ways for producing thin films, such as electron beam evaporation, metalorganic chemical vapor deposition method, atomic layer deposition, RF magnetron sputtering, thermionic vacuum arc and pulsed laser deposition [13,14]. However, solgel method is one of the most widely applied methods, since it is easy, cheap, and handy.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Pure and Doped TiO₂ Thin Films Prepared by Sol-Gel Spin-Coating Method

et al. 2017

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In this study, using spin-coating sol-gel method we fabricated TiO2 thin films, doped with different concentrations (1, 2, and 3 mole %) of Ce, Dy, and Eu. Characterization of the prepared samples was performed by means of the X-ray diffraction, scanning electron microscopy, ultraviolet visible absorption, and differential thermal and thermo gravimetric analysis. X-ray diffraction measurements have shown that in Eu and Dy-doped samples crystal structure consists of mixed rutile and the dominant anatase phases, however the Ce doped samples consist of anatase phase only. Scanning electron microscopy images have revealed that while average thin film thickness of the Dy-doped samples decreases with increasing concentration of Dy, the average film thicknesses of samples doped with Ce and Eu increases with increasing concentrations of these dopants. Ultraviolet visible absorption spectroscopy measurements have shown that while absorbances of the samples doped by 1 and 2 mole % of the dopants have nearly similar properties, these properties differ from each other for 3 mole % of the dopants. Finally, differential thermal and thermo gravimetric analyses have shown that the chemical reactions and weight losses of the samples have occurred at the expected temperatures.

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Properties of Eu doped TiO2 nanoparticles prepared by using organic additives

Cited by 40 publications

References 54 publications

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

Band edge movement in dye sensitized Sm-doped TiO₂ solar cells: a study by variable temperature spectroelectrochemistry

Comparison of Pure and Doped TiO₂ Thin Films Prepared by Sol-Gel Spin-Coating Method

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Properties of Eu doped TiO2 nanoparticles prepared by using organic additives

Cited by 40 publications

References 54 publications

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

Band edge movement in dye sensitized Sm-doped TiO2 solar cells: a study by variable temperature spectroelectrochemistry

Comparison of Pure and Doped TiO2 Thin Films Prepared by Sol-Gel Spin-Coating Method

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Product

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Band edge movement in dye sensitized Sm-doped TiO₂ solar cells: a study by variable temperature spectroelectrochemistry

Comparison of Pure and Doped TiO₂ Thin Films Prepared by Sol-Gel Spin-Coating Method