Microstructure, dielectric properties and optical band gap control on the photoluminescence behavior of Ba[Zr0.25Ti0.75]O3 thin films

Cavalcante, L. S.; Sczancoski, J. C.; Vicente, F.; Frabbro, M. T.; Li, Máximo Siu; Varela, José Arana; Longo, Elson

doi:10.1007/s10971-008-1841-x

Cited by 85 publications

(16 citation statements)

References 55 publications

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“…This observation confirmed that the PL response is directly ascribed to localized states in the band gap due to structural defects in the (Ca 1Àx Cu x ) TiO 3 crystalline structure. The green emission (less energetic) is accompanied by a reduction in the E gap for CCTO2 crystals, which is related to the insert of deep defects between the valence and conduction bands [57]. Moreover, we have observed a low concentration of shallow defects in violeteblue region in PL spectra for all (Ca 1Àx From these FE-SEM images shown in the Fig.…”

Section: Photoluminescence Analyses: Emission Spectra Studiesmentioning

confidence: 51%

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

Oliveira¹,

Moura²,

Mazzo³

et al. 2012

Materials Chemistry and Physics

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Section: Photoluminescence Analyses: Emission Spectra Studiesmentioning

confidence: 51%

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

Oliveira¹,

Moura²,

Mazzo³

et al. 2012

Materials Chemistry and Physics

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“…This mechanism occurs by the grain boundary motion owing to a reduction of the total grain boundary surface energy. The thermal energy leads to an increase in the diffusion rate and consequently intensifies the formation of necks between grains, which was confirmed from (AFM þ FESEM) microstructures [13]. The average crystallite size of the films estimated using Scherrer's formula increases from 9 to 18 nm with an increasing the O 2 SCCM.…”

Section: 2mentioning

confidence: 60%

Effect of annealing and atmosphere on the structure and optical properties of Mg₂TiO₄thin films obtained by the radio frequency magnetron sputtering method

Bhuyan

Kumar

Perumal

et al. 2013

Journal of Experimental Nanoscience

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In this article, nanocrystalline Mg 2 TiO 4 (MTO) thin films were deposited on quartz substrates with a thickness ranging from 200 to 300 nm at ambient temperature by the radio frequency magnetron sputtering method. These films were kept under O 2 standard cubic centimeters per minute (SCCM) and, post deposition, annealing in air at 500 C for 1 h. The structure of the sintered target and films were analysed by X-ray diffraction (XRD). The XRD patterns indicated that these films are amorphous structurally, and annealing process induces the formation of crystalline phase. The microstructure and surface morphology of the MTO films were studied by field emission scanning electron microscopy and atomic force microscopy. The post-deposition annealing resulted in an amorphous-crystalline phase transition in the films, which is accompanied by an increase in the refractive index and decrease in the optical bandgap. The annealed films exhibit a refractive index of 1.98-2.03 (at 600 nm) with an optical bandgap values between 4.44 and 4.58 eV. The increase of refractive index for annealed films can be attributed to increase of crystalline nature and packing densities. The O 2 SCCM and annealing also greatly affected the photoluminescence spectra. In addition, the characteristic emission sharp peak and shoulder peaks at 357, 409 and 466 nm were detected.

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“…The different electronic interactions of Ti with N anions by co-doping causes partial electron transformation from the N to Ti and an increase of the electron density on Ti because of the lower electro negativity of nitrogen compared with oxygen [26,27]. On the other hand, the shifts of Ti 2p 3/2 and the O 1s peaks are due to the introduction of oxygen vacancies into the TiO 2 lattice [28,29]. In our related experiments, the formation of single-electron-trapped oxygen vacancy in the structure of [O Ti O Ti ] have been confirmed for N-doped TiO 2 sample using electron spin resonance (ESR) [30].…”

Section: Xps Analysesmentioning

confidence: 99%

Photoelectrochemical and photocatalytic properties of N+S co-doped TiO2 nanotube array films under visible light irradiation

Yan

Zhang

Hou

et al. 2011

Materials Chemistry and Physics

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a b s t r a c tIn this paper, we report on the co-doping nitrogen and sulfur has been achieved in the TiO 2 nanotube array films by treatment with thiourea and calcination under vacuum at 500• C for 3 h. The samples were characterized by scanning electron microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy. XPS spectra revealed that N might coexist in the forms of N Ti O and N O Ti, S was incorporated into the lattice of TiO 2 through substituting oxygen atoms in the N + S co-doped TiO 2 nanotube array films. XRD patterns indicated that improved crystallinity was obtained for N + S co-doped TiO 2 nanotube arrays as compared to that of undoped TiO 2 nanotube arrays. In photoelectrochemical measurements, the photocurrent of N + S co-doped TiO 2 nanotube array films was greatly enhanced compared to that of undoped samples under visible light irradiation. And the photocatalytic activities of the samples were evaluated on the removal of methylene blue under visible light irradiation. The N + S co-doped TiO 2 nanotube array films showed a better photocatalytic activity than the undoped sample due to the N, S doping.

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Microstructure, dielectric properties and optical band gap control on the photoluminescence behavior of Ba[Zr0.25Ti0.75]O3 thin films

Cited by 85 publications

References 55 publications

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

Effect of annealing and atmosphere on the structure and optical properties of Mg₂TiO₄thin films obtained by the radio frequency magnetron sputtering method

Photoelectrochemical and photocatalytic properties of N+S co-doped TiO2 nanotube array films under visible light irradiation

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Microstructure, dielectric properties and optical band gap control on the photoluminescence behavior of Ba[Zr0.25Ti0.75]O3 thin films

Cited by 85 publications

References 55 publications

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

Effect of annealing and atmosphere on the structure and optical properties of Mg2TiO4thin films obtained by the radio frequency magnetron sputtering method

Photoelectrochemical and photocatalytic properties of N+S co-doped TiO2 nanotube array films under visible light irradiation

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Effect of annealing and atmosphere on the structure and optical properties of Mg₂TiO₄thin films obtained by the radio frequency magnetron sputtering method