Spectroscopic studies of thermal treatment effect on the composition and size of CdS1−xSex nanocrystals in borosilicate glass

Azhniuk, Yu. M.; Lopushansky, V. V.; Gomonnai, A. V.; Yukhymchuk, V.О.; Turok, I. I.; Studenyak, Yaroslav

doi:10.1016/j.jpcs.2007.08.009

Cited by 27 publications

(30 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In some studies an increase of sulphur concentration in CdS 1 À x Se x nanocrystals with the thermal treatment temperature and/or duration is reported [18]. In other cases, including our recent study, intense thermal treatment results in a noticeable increase of selenium content in the nanocrystals [7,28].…”

Section: Introductionsupporting

confidence: 51%

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

Azhniuk

Gomonnai

Hutych

et al. 2010

Journal of Crystal Growth

Self Cite

View full text Add to dashboard Cite

Section: Introductionsupporting

confidence: 51%

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

Azhniuk

Gomonnai

Hutych

et al. 2010

Journal of Crystal Growth

Self Cite

View full text Add to dashboard Cite

“…The most reasonable explanation, in our opinion, is related to the fact that at high x not only metal content, but also chalcogen content in the NCs varies with the heat treatment conditions. In our recent paper we observed a clear increase of Se content in Se-rich CdS 1-x Se x NCs with heat treatment by up to 8 % [28] In the case of such compositional variation for the Se-rich quaternary NCs under heat treatment one should also expect a considerable decrease of the sulphide-like LO 2 phonon band intensity. However, it remains almost the same implying some additional factors affecting the Raman scattering in quaternary Cd 1-y Zn y S 1-x Se x NCs.…”

mentioning

confidence: 71%

Phonon spectra of quaternary Cd_1–yZn_y S_1–xSe_x semiconductor nanocrystals grown in a glass matrix

Azhniuk

Milekhin

Gomonnai

et al. 2009

Phys. Status Solidi (c)

View full text Add to dashboard Cite

Quaternary Cd1–y Zny S1–x Sex nanocrystals are obtained in a borosilicate glass matrix by solid‐state precipitation at temperatures within 625 to 700 °C. Raman spectroscopy is applied to determine the nanocrystal composition and to show its dependence on the heat treatment temperature and duration. Diffusion‐induced migration of Zn ions from the matrix to the NCs results in its content increase up to ∼20% at the heat treatment; meanwhile for Se‐rich NCs an increase of Se content is also observed. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

“…Though a number of in-depth studies have addressed the phonon spectra of colloidal [14][15][16][17][18][19][20], glass-embedded [21][22][23] NCs, and epitaxial nanostructures [24][25][26], a significant divergence of the results exists concerning both the nature of the modes and their response to such factors as size, surface conditions, properties of the hosting medium and so forth. In particular, the apparently similar Raman spectra of a wide range of compounds (e.g., II-VI, III-V, and IV) and NC morphologies (dots, rods, tetrapods, wires, and discs) have been assigned differently.…”

mentioning

confidence: 99%

Phonon Spectra of Small Colloidal II-VI Semiconductor Nanocrystals

Dzhagan

Valakh

Mel’nik

et al. 2012

International Journal of Spectroscopy

View full text Add to dashboard Cite

Resonant Raman spectroscopy has been employed to explore the first-and higher-order phonon spectra of several kinds of II-VI nanocrystals (NCs), with the aim of better understanding of the nature of phonon modes and forming a unified view onto the vibrational spectrum of semiconductor NCs. Particularly, besides the previously discussed TO, SO, LO, and 2LO modes, the combinational modes of TO+LO and SO+LO can be assumed to account for the lineshape of the spectrum below 2LO band. No trace of 2TO or 2SO band was detected, what can be the result of the dominance of Fröhlich mechanism in electron-phonon coupling in II-VI compounds. The resonant phonon Raman spectrum of NCs smaller than 2 nm is shown to be dominated by a broad feature similar to the SO mode of larger NCs or phonon density of states of a bulk crystal.The understanding of the phonon spectrum of semiconductor nanocrystals (NCs), electron-phonon coupling (EPC), dependence of the phonon spectra on the NC size, surfacebound moieties, and extended environment is of a large fundamental and application significance [1][2][3][4][5][6][7][8][9][10][11] due to the determinant role phonons play in the optical and electrical properties of semiconductor nanostructures [12,13]. Though a number of in-depth studies have addressed the phonon spectra of colloidal [14][15][16][17][18][19][20], glass-embedded [21][22][23] NCs, and epitaxial nanostructures [24][25][26], a significant divergence of the results exists concerning both the nature of the modes and their response to such factors as size, surface conditions, properties of the hosting medium and so forth. In particular, the apparently similar Raman spectra of a wide range of compounds (e.g., II-VI, III-V, and IV) and NC morphologies (dots, rods, tetrapods, wires, and discs) have been assigned differently.Recently, attempts were made to build a general picture of the phonon spectrum of various semiconductor NCs, based on analysis of the experimental Raman data and appropriate models [14,27,28]. This paper further explores the first-and higher-order phonon spectra of several kinds of II-VI NCs, as well as their similarity to other compounds, with the aim of better understanding of the vibrational spectrum of small NCs. High-quality NC samples were selected for this study in order to resolve Raman features, which are usually smeared by size dispersion, structural disorder, or low signal-to-noise ratio.The NC samples studied in this work have been prepared by means of colloidal chemistry according to protocols reported elsewhere [29][30][31][32], and CdSe, CdS, and CdTe NC samples of the same mean diameter (∼4 nm) were selected. Another sort of NCs studied were ultrasmall NCs of about 1.8 nm mean diameter, which revealed distinct Raman spectra. The attempts to measure the size and shape of these NCs directly by electron microscopy were unsuccessful [19], obviously due to ultrasmall NC size and charging of the stabilizing polymer. The broad X-ray features of these ultrasmall NCs [3] indicated their small size or/and n...

show abstract

Spectroscopic studies of thermal treatment effect on the composition and size of CdS1−xSex nanocrystals in borosilicate glass

Cited by 27 publications

References 39 publications

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

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

Phonon spectra of quaternary Cd_1–yZn_y S_1–xSe_x semiconductor nanocrystals grown in a glass matrix

Phonon Spectra of Small Colloidal II-VI Semiconductor Nanocrystals

Contact Info

Product

Resources

About

Spectroscopic studies of thermal treatment effect on the composition and size of CdS1−xSex nanocrystals in borosilicate glass

Cited by 27 publications

References 39 publications

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

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

Phonon spectra of quaternary Cd1–yZny S1–xSex semiconductor nanocrystals grown in a glass matrix

Phonon Spectra of Small Colloidal II-VI Semiconductor Nanocrystals

Contact Info

Product

Resources

About

Phonon spectra of quaternary Cd_1–yZn_y S_1–xSe_x semiconductor nanocrystals grown in a glass matrix