Thermal treatment-dependent chemical composition of ternary CdS1−xSex nanocrystals grown in borosilicate glass

Azhniuk, Yu. M.; Gomonnai, A. V.; Hutych, Yu. I.; Lopushansky, V. V.; Turok, I. I.; Yukhymchuk, V.О.; Zahn, Dietrich R. T.

doi:10.1016/j.jcrysgro.2010.02.033

Cited by 30 publications

(46 citation statements)

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“…The difference of the LO phonon frequencies is known to be a good measure of the nanocrystal chemical composition [6,7,[10][11][12]. The observed slight increase of selenium content in the nanocrystals with heat treatment temperature is consistent with the earlier reported effect of segregation of minority chalcogen atoms in glass-embedded CdSe 1Àx S x nanocrystals with increasing heat treatment temperature and/or duration [18].…”

Section: Methodssupporting

confidence: 89%

“…Low-wavenumber Raman scattering by acoustic phonons due to the confinement-related selection rules relaxation in CdSe 1Àx S x nanocrystals was used to estimate the average nanocrystal size [1][2][3][4][5]. Raman spectroscopy was also proven to be a very efficient tool to examine the chemical composition of ternary II-VI nanocrystals diluted in the glass matrix, based on the LO phonon frequencies taking into account the specific effects related to glass matrix pressure, phonon confinement, surface phonon scattering and compositional and size dispersion of nanocrystals within the ensemble [6][7][8][9][10][11][12][13][14][15][16][17][18].Fabrication of II-VI semiconductor nanocrystals in glass matrices is performed by a well-elaborated diffusion-limited growth technique [19][20][21]. Recently Raman scattering studies revealed that not only the nanocrystal size, but also their composition is affected by the growth conditions (thermal treatment temperature and duration) [16,18].…”

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confidence: 99%

“…Raman spectroscopy was also proven to be a very efficient tool to examine the chemical composition of ternary II-VI nanocrystals diluted in the glass matrix, based on the LO phonon frequencies taking into account the specific effects related to glass matrix pressure, phonon confinement, surface phonon scattering and compositional and size dispersion of nanocrystals within the ensemble [6][7][8][9][10][11][12][13][14][15][16][17][18].…”

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confidence: 99%

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Precipitates of selenium and tellurium in II–VI nanocrystal‐doped glass probed by Raman scattering

Azhniuk

Lopushansky

Hutych

et al. 2011

Physica Status Solidi (b)

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, Phone: þ380 312 643822, Fax: þ380 312 643650As follows from Raman studies, the formation of cadmium chalcogenide nanocrystals in borosilicate glass under thermal treatment at 625-700 8C can be accompanied by precipitation of elemental Se or Te in the form of molecular Se 2 or Te 2 clusters or larger aggregations. The clusters are in most cases formed when the thermal treatment temperature and/or duration values are beyond the range most suitable for the formation of the II-VI nanocrystals. Larger aggregations are formed at intense thermal treatment, precipitation of tellurium being achieved much easier than that of selenium.1 Introduction II-VI (mostly CdSe 1Àx S x ) semiconductor nanocrystal-doped glasses were extensively studied by Raman spectroscopy and the excellent applicability of this technique to determine the nanocrystal parameters was demonstrated. Low-wavenumber Raman scattering by acoustic phonons due to the confinement-related selection rules relaxation in CdSe 1Àx S x nanocrystals was used to estimate the average nanocrystal size [1][2][3][4][5]. Raman spectroscopy was also proven to be a very efficient tool to examine the chemical composition of ternary II-VI nanocrystals diluted in the glass matrix, based on the LO phonon frequencies taking into account the specific effects related to glass matrix pressure, phonon confinement, surface phonon scattering and compositional and size dispersion of nanocrystals within the ensemble [6][7][8][9][10][11][12][13][14][15][16][17][18].Fabrication of II-VI semiconductor nanocrystals in glass matrices is performed by a well-elaborated diffusion-limited growth technique [19][20][21]. Recently Raman scattering studies revealed that not only the nanocrystal size, but also their composition is affected by the growth conditions (thermal treatment temperature and duration) [16,18]. Moreover, it was reported that at certain thermal treatment conditions molecular clusters of selenium can be formed in CdSe and CdSe 1Àx S x nanocrystal-doped glasses [22].

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Section: Methodssupporting

confidence: 89%

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confidence: 99%

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confidence: 99%

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Precipitates of selenium and tellurium in II–VI nanocrystal‐doped glass probed by Raman scattering

Azhniuk

Lopushansky

Hutych

et al. 2011

Physica Status Solidi (b)

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“…When the particle size is less than the Bohr radius, the materials are in the strong confinement region, and both electron and hole confinement were assumed to be dominant relative to the Coulomb interaction. 34,35 This results in the splitting of both valence and conduction bands into a series of sub-bands, and a band gap is formed between the top of the sub-band of the valence band and the bottom of the sub-band of the conduction band 36 The band gap energy due to the confinement is shown as per the equation (1).…”

Section: Resultsmentioning

confidence: 99%

Quantum confinement of Bi2S3 in glass with magnetic behavior

et al. 2013

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The novel Bi2S3 quantum dots (QDs) glass nanosystems with unique magnetic properties have been investigated. The monodispersed QDs of size in the range of 3 to 15 nm were grown in the glass matrix. The optical study of these nanosystems clearly demonstrated the size quantization effect resulting in a pronounced band gap variation with QD size. The magnetic properties of the pristine glass and the Bi2S3 QD glass nanosystems were investigated by VSM and SQUID magnetometer. The pristine glass did not show any ferromagnetism while the Bi2S3 glass nanosystems showed significant and reproducible ferromagnetism. We also investigated the effect of the size of Bi2S3 QDs on the magnetic properties. The saturation magnetization for the 15 nm QD glass-nanosystem (124 memu/g) was observed to be higher as compared to the 3nm QD glass nanosystem (58.2 memu/g). The SQUID measurement gave the excellent hysteresis up to 300K. Surprisingly, the bulk Bi2S3 powder is diamagnetic in nature but Bi2S3 quantum dots glass nanosystem showed the ferromagnetic behavior for the first time. The investigated novel QD glass-nanosystem may have a potential application in spintronic devices and most importantly, this nanosystem can be fabricated in any usable shape as per the device requirement.

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“…450-500 °C and cooled down slowly to room temperature to remove the stresses. The doped 20 glass was cut into three pieces. To study the effect of temperature and time of annealing on crystallization of Bi 2 S 3 in the glass matrix, the cut pieces of as prepared glass nanosystems were heat treated at 550, 575 and 600 °C for 8 hrs.…”

Section: Materials Preparationmentioning

confidence: 99%

A stable Bi₂S₃ quantum dot–glass nanosystem: size tuneable photocatalytic hydrogen production under solar light

et al. 2015

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The present work comprises a novel approach to design Bismuth sulfide (Bi 2 S 3 ) quantum dots (QD's) glass nanocomposite system by confining nano Bi 2 S 3 in designated glass composition for solar light driven hydrogen (H 2 ) production. Numerous methods have been reported for the synthesis of Bi 2 S 3 , however, we have demonstrated the synthesis of Bi 2 S 3 QD's (0.5-0.7%) in the silicatete glass using melt and quench method. X-Ray diffraction and electron diffraction patterns of glass nanosystem exhibits 10 orthorhombic crystallite system of the Bi 2 S 3 QD's. Transmission Electron Microscopy demonstrates that the 3-5 and 7-10 nm size Bi 2 S 3 QD's distributed homogeneously in a monodispersed form in the glass domain and on the surface with a ''partially embedded exposure'' configuration. The role of glass on control of size and shape of Bi 2 S 3 QD's and their effect on the photocatalytic hydrogen generation has been discussed. The utmost H 2 production i.e. 6418.8 µMole h -1 g -1 was achieved for the Bi 2 S 3 -glass 15 nanosystem under solar light irradiation.This glass nanosystem instruct an excellent photo stability against photocorrosion and also a facile catalytic function. Therefore, even a very small amount of Bi 2 S 3 QD's is able to photodecompose H 2 S and produce hydrogen under visible light.The salient features of this QD's glass nanosystem are reusability after simple washing, enhanced stability and remarkable catalytic activity. 20 65 characterized thoroughly for the investigation of structural and optical properties. The effect of Bi 2 S 3 QD's size on the hydrogen production has been demonstrated for the first time. It is

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Thermal treatment-dependent chemical composition of ternary CdS1−xSex nanocrystals grown in borosilicate glass

Cited by 30 publications

References 46 publications

Precipitates of selenium and tellurium in II–VI nanocrystal‐doped glass probed by Raman scattering

Precipitates of selenium and tellurium in II–VI nanocrystal‐doped glass probed by Raman scattering

Quantum confinement of Bi2S3 in glass with magnetic behavior

A stable Bi₂S₃ quantum dot–glass nanosystem: size tuneable photocatalytic hydrogen production under solar light

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Thermal treatment-dependent chemical composition of ternary CdS1−xSex nanocrystals grown in borosilicate glass

Cited by 30 publications

References 46 publications

Precipitates of selenium and tellurium in II–VI nanocrystal‐doped glass probed by Raman scattering

Precipitates of selenium and tellurium in II–VI nanocrystal‐doped glass probed by Raman scattering

Quantum confinement of Bi2S3 in glass with magnetic behavior

A stable Bi2S3 quantum dot–glass nanosystem: size tuneable photocatalytic hydrogen production under solar light

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Product

Resources

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A stable Bi₂S₃ quantum dot–glass nanosystem: size tuneable photocatalytic hydrogen production under solar light