Evidence for formation of Se molecular clusters during precipitation of CdSe1−x S x nanoparticles in glass

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

doi:10.1007/s00339-008-4918-z

Cited by 10 publications

(6 citation statements)

References 34 publications

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“…Here, we observed selenium precipitates in glass only when its composition in the initial II-VI nanocrystals is quite considerable (not less than 75%) [22]. On the other hand, tellurium precipitates are readily formed at Te concentration already about x % 0.5 (Fig.…”

Section: Methodsmentioning

confidence: 81%

“…Similar peaks were observed for other batches of samples with Se-rich CdSe 1Àx S x nanocrystals in the case that the thermal treatment duration and temperature is beyond the range optimal for the CdSe 1Àx S x nanocrystal formation. Based on the comparison of the frequencies and half widths of the peaks under consideration with the Raman data for various modifications of selenium, the peaks at 323 and 647 cm À1 were ascribed to Se 2 molecular clusters, formed in the glass matrix during thermal treatment and more or less randomly distributed over the matrix volume [22].…”

Section: Methodsmentioning

confidence: 99%

“…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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confidence: 98%

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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: Methodsmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 98%

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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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“…2(b). A further increase of temperature or (for higher T a values) duration can be unfavourable for nanocrystal growth -at such conditions precipitation of clusters of elemental selenium in the glass is reported [42]. Simultaneously, we observed an increase of the average nanocrystal size with the thermal treatment duration and/or temperature as is typical for II-VI nanocrystals grown in a glass matrix and generally similar to the behaviour of another sample series of Se-rich CdS 1 À x Se x nanocrystals, described in detail in [28].…”

Section: Resultsmentioning

confidence: 97%

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

Azhniuk

Gomonnai

Hutych

et al. 2010

Journal of Crystal Growth

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“…The 710 nm band (B1) that is initially observed is due to formation of diselenide ions, which are formed early on to quickly reduce the instability of a supersaturated semiconductor solution . These are later consumed as CdS x Se 1‐x nanoparticles nucleate and grow, which is evidenced by the disappearance of the 710 nm band.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast Laser Fabrication of Hybrid Micro‐ and Nano‐Structures in Semiconductor‐doped Borosilicate Glasses

Mardilovich

Fletcher

Troy

et al. 2013

Int J of Appl Glass Sci

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Femtosecond (fs)-laser processing of CdS x Se 1-x -doped borosilicate glasses was investigated to create hybrid multiscale structures consisting of semiconductor nanocrystals embedded in microscopic domains defined by the laser irradiation. Laser processing was carried out with both low (1 KHz) and high (1 MHz) repetition rate fs-lasers using pulse fluences between 2 and 2000 J/cm 2 and sample scan speeds ranging from 0.05 to 4 mm/s. The samples were subsequently heat-treated at temperatures between 500 and 600°C and characterized using optical microscopy, electron microscopy, wave dispersive x-ray spectroscopy (WDS), and confocal fluorescence microscopy. For 1-KHz laser processing conditions, nanocrystal precipitation showed no significant distinction between the modified and unmodified regions in the sample. Using a 1-MHz pulse repetition rate laser, however, we introduced chemical inhomogeneity across microscopic modifications, forming three chemically distinct regions: sodium and potassium-rich, zinc rich, and silicon rich. These regions exhibited different semiconductor precipitation dynamics, with the sodium and potassium-rich region showing strong preferential precipitation of cadmium sulfo-selenide nanoparticles, thereby localizing quantum dot precipitation to these chemically defined microcrucibles in the glass.

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Evidence for formation of Se molecular clusters during precipitation of CdSe1−x S x nanoparticles in glass

Cited by 10 publications

References 34 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

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

Ultrafast Laser Fabrication of Hybrid Micro‐ and Nano‐Structures in Semiconductor‐doped Borosilicate Glasses

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