Photopolymerization of water-soluble acrylic monomers induced by colloidal CdS and Cd x Zn1 − x S nanoparticles

Stroyuk, A. L.; Sobran, Ivan V.; Korzhak, A. V.; Raevskaya, A. E.; Kuchmiy, Stepan Ya.

doi:10.1007/s00396-007-1824-4

Cited by 13 publications

(4 citation statements)

References 30 publications

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“…The fact of cadmium metal formation was confirmed by the methylviologen cation-radical MV •+ formation when MV 2+ was added to the illuminated CdS-PEI solution, due to the reaction Cd 0 + 2MV 2+ → Cd 2+ + 2MV •+ . The difference in the mechanism of photochemical corrosion between the present PEI-stabilized CdS QDs and other polymer-capped CdS nanoparticles , may reflect the different mechanism of primary photoprocesses, in particular, electron−hole recombination, and needs further investigation.…”

Section: Resultsmentioning

confidence: 96%

Synthesis and Characterization of White-Emitting CdS Quantum Dots Stabilized with Polyethylenimine

et al. 2010

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We report on the synthesis and optical and structural characterization of ultrasmall (<2 nm) CdS nanoparticles with a narrow size distribution of 10% prepared in aqueous and alcohol solutions of polyethyleneimine (PEI). The PEI-stabilized CdS nanoparticles reveal a structured absorption band with the first excitonic maximum at 3.5 eV and broad-band photoluminescence with quantum yields of 12−14% in water, 18−20% in ethanol (80 vol %), and up to 60−70% in solid PEI films at room temperature. The nature of the photoluminescence was studied by using the time- and wavelength-dependent emission measurements. The role of precursor cadmium(II)−PEI complex in the formation of uniform and ultrasmall luminescent CdS nanoparticles, as well as the dynamic emission quenching by water, are discussed. A study of the photochemical properties of PEI-stabilized CdS nanoparticles both under continuous and nanosecond pulse illumination showed excellent stability of solid PEI films incorporating CdS nanoparticles toward UV illumination and reductive character of the CdS nanoparticle photocorrosion in aqueous solutions.

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Section: Resultsmentioning

confidence: 96%

Synthesis and Characterization of White-Emitting CdS Quantum Dots Stabilized with Polyethylenimine

et al. 2010

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“…In view of prospective bio-applications of CdSe or CdTe NPs, the ZnS shell is expected to protect the cell from possible cadmium ion release. Direct synthesis of NPs in aqueous solutions of biocompatible polymers [9][10][11], like those used in the present work, has its advantage as a low-cost and 'green' procedure, and also reduces the cytotoxicity of such II-VI NPs.…”

Section: Introductionmentioning

confidence: 99%

The influence of shell parameters on phonons in core–shell nanoparticles: a resonant Raman study

Dzhagan

Valakh

Raevska³

et al. 2009

Nanotechnology

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The effect of shells of various thicknesses on the vibrational resonant Raman spectra of CdSe/ZnS core-shell nanoparticles is studied. The dependence of the core-shell structure on the method of shell deposition is derived from a comparison of the vibrational and photoluminescence spectra of nanoparticles. Along with the appearance of peaks attributed to the shell, the phonon spectrum of the core undergoes significant changes upon shell growth. The change of the CdSe LO peak lineshape in core-shell nanoparticles is discussed with respect to possible changes in the spectrum of both optical and acoustical phonons upon shell formation. Based on the observed decrease of the CdSe 2LO/LO peak intensity ratio, a weakening of exciton coupling to the CdSe LO phonon upon ZnS shell deposition is supposed. The change in the carrier localization volumes upon shell formation is discussed as a possible reason for the reduced coupling.

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“…Zinc sulfide (band gap of 3.54 eV) and cadmium sulfide (band gap of 2.42 eV) were chosen as target products to demonstrate this novel synthesis approach because these are two widely used II−VI semiconducting materials. Among other applications, both metal sulfides and several of their alloys with other metals or chalcogens are used as phosphors, in photovoltaic devices, as biosensors and for photocatalytic reactions. , For example, their role in the photocatalytic generation of hydrogen gas recently has received increased attention …”

Section: Resultsmentioning

confidence: 99%

“…With 42 m 2 /g and 50 m 2 /g for ZnS and CdS, respectively, the materials display surface area values that are in the range of what is currently used for some catalytic conversion applications. The overall surface area of the material can be further enhanced by depositing the films onto macroporous substrates, a technique that is frequently used in catalyst design. , …”

Section: Resultsmentioning

confidence: 99%

Nanostructured ZnS and CdS Films Synthesized using Layered Double Hydroxide Films as Precursor and Template

et al. 2009

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Anion exchange reactions in layered double hydroxide films (M(OH)(2-x)(NO(3))(x).mH(2)O) followed by solid state conversion reactions are shown to yield micrometer-sized unsupported metal sulfide (M = Zn, Cd) films with unique textured morphologies. The characteristic three-dimensional nanostructured film morphology and crystallinity of the initial films are retained in the metal sulfide films although these conversion reactions involve anion exchanges concomitant with significant rearrangements of the crystal structures. Surface areas of 42 m(2)/g for zinc sulfide and 50 m(2)/g for cadmium sulfide thin films are observed. These values correspond to an increase in surface area of 75% for the Zn(5)(OH)(8)(NO(3))(2).2H(2)O to zinc sulfide conversion, while the cadmium sulfide films exhibit more than three times the surface area of their precursor material, Cd(OH)(NO(3)).H(2)O. The three-dimensional morphology of the resulting films is thus observed to combine the physical properties of the bulk materials with the advantages of higher surface areas typically associated with nanostructured or porous materials. The layered double hydroxide materials used in this study to provide both structural and chemical templates were prepared using the mild conditions of a biologically inspired vapor-diffusion catalytic synthesis.

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Photopolymerization of water-soluble acrylic monomers induced by colloidal CdS and Cd x Zn1 − x S nanoparticles

Cited by 13 publications

References 30 publications

Synthesis and Characterization of White-Emitting CdS Quantum Dots Stabilized with Polyethylenimine

Synthesis and Characterization of White-Emitting CdS Quantum Dots Stabilized with Polyethylenimine

The influence of shell parameters on phonons in core–shell nanoparticles: a resonant Raman study

Nanostructured ZnS and CdS Films Synthesized using Layered Double Hydroxide Films as Precursor and Template

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