Confocal spectromicroscopy of amorphous and nanocrystalline tungsten oxide films

Kuzmin, Alexei; Kalendarev, R.; Kursitis, A.; Purans, J.

doi:10.1016/j.jnoncrysol.2007.02.014

Cited by 34 publications

(24 citation statements)

References 20 publications

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“…RS data were taken at room temperature (20C) by use of a confocal microscope with a "Nanofinder-S" (SOLAR TII, Ltd.) spectrometer [15]. The measurements were performed through a Nikon CF Plan Apo 100 (NA = 0.95) optical objective.…”

Section: Sample Preparation and Characterization Techniquesmentioning

confidence: 99%

“…Therefore we can exclude the presence of a NiO phase in the mixed films with x ≤ 0.45. On the other hand NiWO 4 has a very strong Raman signal and is easily detected in thin films [15]. This signal is dominated by the 891 cm -1 mode, which is typical for tungstates and corresponds to stretching vibration of the W-O pair in the WO 6 group, a socalled "internal" mode [38].…”

Section: Lattice Dynamics Probed By Raman Spectroscopymentioning

confidence: 99%

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Structure and composition of sputter-deposited nickel-tungsten oxide films

et al. 2011

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Films of mixed nickel-tungsten oxide, denoted Ni x W 1-x oxide, were prepared by reactive DC magnetron co-sputtering from metallic targets and were characterized by Rutherford backscattering spectrometry, X-ray photoelectron spectroscopy, X-ray diffractometry and Raman spectroscopy. A consistent picture of the structure and composition emerged, and at x < 0.50 the films comprised a mixture of amorphous WO 3 and nanosized NiWO 4 , at x = 0.50 the nanosized NiWO 4 phase was dominating, and at x > 0.50 the films contained nanosized NiO and NiWO 4 , and possibly also WO 3 .

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Section: Sample Preparation and Characterization Techniquesmentioning

confidence: 99%

Section: Lattice Dynamics Probed By Raman Spectroscopymentioning

confidence: 99%

Structure and composition of sputter-deposited nickel-tungsten oxide films

et al. 2011

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“…It is a technologically important material, which finds applications such as scintillation detectors, laser-active hosts, optical fibers, sensors, and phase-change optical recording media [2][3][4][5][6][7]. In addition, ZnWO 4 shows highly efficient (> 50%) picosecond multiple Stokes and anti-Stokes generation when used as a Raman-active crystal in solid-state lasers, based on stimulated Raman scattering (SRS) [5,8].…”

Section: Introductionmentioning

confidence: 99%

Electronic excitations in ZnWO4 and ZnxNi1−x WO4 (x = 0.1 − 0.9) using VUV synchrotron radiation

et al. 2011

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Abstract:The photoluminescence spectra and luminescence excitation spectra of pure microcrystalline and nano-sized ZnWO 4 as well as the Zn Ni 1− WO 4 solid solutions were studied using vacuum ultraviolet (VUV) synchrotron radiation. The samples were also characterized by x-ray powder diffraction. We found that: (i) the shape of the photoluminescence band at 2.5 eV, being due to radiative electron transitions within the [WO 6 ] 6− anions, becomes modulated by the optical absorption of Ni 2+ ions in the Zn Ni 1− WO 4 solid solutions; and (ii) no significant change in the excitation spectra of Zn 0 9 Ni 0 1 WO 4 is observed compared to pure ZnWO 4 . At the same time, a shift of the excitonic bands to smaller energies and a set of peaks, attributed to the one-electron transitions from the top of the valence band to quasi-localized states, were observed in the excitation spectrum of nano-sized ZnWO 4 .PACS (2008)

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“…Tungstates having general formula A 2+ WO 4 are extremely interesting compounds, which find many practical applications as scintillators [1,2,3], optical fibres [4], solid state Raman lasers [5,6], catalysts [7], high-temperature solid lubricants [8], gas sensors [9], and phase-change optical memories [10]. Among them wolframite-type ZnWO 4 , also known as mineral sanmartinite, has attracted recently a considerable interest both from experimental and theoretical points of view [11,12,13,14] due to optical and catalytic properties as well as possibility of preparation in nanosized [9,15] and thin film forms [10,16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Among them wolframite-type ZnWO 4 , also known as mineral sanmartinite, has attracted recently a considerable interest both from experimental and theoretical points of view [11,12,13,14] due to optical and catalytic properties as well as possibility of preparation in nanosized [9,15] and thin film forms [10,16,17].…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic structure of ZnWO4 nanoparticles

Kalinko

Kuzmin

2011

Journal of Non-Crystalline Solids

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Static and dynamic structure of ZnWO 4 nanoparticles, synthesized by co-precipitation technique, has been studied by temperature dependent x-ray absorption spectroscopy at the Zn K-edge and W L 3 -edge. The complementary experimental techniques, such as x-ray powder diffraction, Raman and photoluminescence spectroscopies, have been used to understand the variation of vibrational, optical, and structural properties of nanoparticles, compared to microcrystalline ZnWO 4 . Our results indicate that the structure of nanoparticles experiences strong relaxation leading to the significant distortions of the WO 6 and ZnO 6 octahedra, being responsible for the changes in optical and vibrational properties.

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Confocal spectromicroscopy of amorphous and nanocrystalline tungsten oxide films

Cited by 34 publications

References 20 publications

Structure and composition of sputter-deposited nickel-tungsten oxide films

Structure and composition of sputter-deposited nickel-tungsten oxide films

Electronic excitations in ZnWO4 and ZnxNi1−x WO4 (x = 0.1 − 0.9) using VUV synchrotron radiation

Static and dynamic structure of ZnWO4 nanoparticles

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