Preparation of stable colloidal solution of cadmium sulfide CdS using ethylenediaminetetraacetic acid

Кожевникова, Н. С.; Ворох, А. С.; Rempel, А. А.

doi:10.1134/s1070363210030035

Cited by 33 publications

(22 citation statements)

References 12 publications

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“…This can be explained by the fact that the dynamic light scattering determines the size of scattering centers rather than the quantum dots them selves. Cadmium sulfide nanoparticles in an aqueous solution are situated in micelles, which include stabi lizer molecules and polarized solvent molecules [10]. These particular formations, each consisting of a CdS nanoparticle, a stabilizing layer and a solvation sphere of the molecules of the dispersion medium, are the scattering centers.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

“…In this work, we studied CdS quantum dots pro duced by wet chemical deposition according to the technique described elsewhere [10]. This method pro vides stable colloidal aqueous solution of quantum dots without the use of toxic organic solvents and gives the opportunity to avoid additional laborious opera tions associated with the solubilization process.…”

Section: Samples Experimental Technique and Experimental Resultsmentioning

confidence: 99%

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Sizes and fluorescence of cadmium sulfide quantum dots

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Abstract-Cadmium sulfide quantum dots have been synthesized by wet chemical deposition from an aque ous solution. The sizes of the quantum dots determined by dynamic light scattering directly in the colloidal solution and by intermittent contact atomic force microscopy in the dry sediment agree with each other. It has been found that splitting of the fluorescence peaks of the quantum dots can be affected by the disorder of the atomic structure of cadmium sulfide quantum dots.

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Section: Discussion Of the Resultsmentioning

confidence: 99%

Section: Samples Experimental Technique and Experimental Resultsmentioning

confidence: 99%

Sizes and fluorescence of cadmium sulfide quantum dots

et al. 2013

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“…Due to fluorescence of biocompatible QDs, the mi gration of individual macromolecules in the living biolog ical cell can be monitored, the cell structure can be visual ized, and various diseases can be diagnosticated using stan dard fluorescence microscopy. [26][27][28] A stable aqueous colloidal solution of cadmium sulfide nanoparticles was obtained 34 by the method of chemical condensation as a result of the work on solving this prob lem. In this method, aqueous solutions of cadmium chlor ide and sodium sulfide are used as sources of cadmium and sulfur atoms, respectively, and an aqueous solution of ethylenediaminetetraacetic acid (EDTA) disodium salt is used as a stabilizer to prevent the coagulation of colloidal particles.…”

Section: Sulfide Nanoparticles With Organic Shellmentioning

confidence: 99%

“…The CdS nanoparticles in an aque ous solution are localized in micelles, whose composition includes molecules of the stabilizer and polarized mole cules of the solvent. 34 These formations consisting of the CdS nanoparticles, stabilizing layer, and solvate shell of molecules of the dispersion medium are scattering sites. The model of a micelle with the CdS QD localized inside is shown in Fig.…”

Section: Sulfide Nanoparticles With Organic Shellmentioning

confidence: 99%

Hybrid nanoparticles based on sulfides, oxides, and carbides

Rempel

2013

Russ Chem Bull

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The methods for synthesis of hybrid nanoparticles based on sulfides, oxides, and carbides of heavy and transition metals were considered. The problem of the influence of the method of synthesis of the hybrid nanoparticles on their atomic structure, morphology of the nanomaterials, and functional properties was analyzed. The areas of practical use of the hybrid nanoparticles were proposed.Key words: nanoparticles, sulfides, oxides, carbides.Special attention is given nowadays to the synthesis and application of nanostructured materials (nanomateri als) based on chemical compounds. 1-3 This is due to the changed properties of nanomaterials compared to those of materials with the same chemical composition but with magnified scale of structural elements. 4-20 The changes in the properties and the appearance of unusual combina tions of properties of the nanomaterials are related to the fact that the physical properties of chemical compounds are formed at distances from several nanometers to several tens of nanometers because of the characteristic nano sized radius of quasi particles (excitons, phonons, mag nons, and polarons). Therefore, a nanoparticle should have optical, electrical, magnetic, mechanical, and other prop erties differed from the properties of particles with the size 100 nm.Indeed, this behavior is observed, for example, for semi conductors with weakly bound excitons. The Bohr radius of exciton in these semiconductors considerably exceeds the atomic size and is equal to several nanometers. As a result, due to a decrease in the particle size of the semi conductor to several nanometers, a confinement of exci tons can be achieved and quantum dots (QDs) can be obtained. The semiconducting properties of QDs differ from those for large nanoparticles and materials. At ambi ent temperature, it is difficult to observe lines related to exciton states in the luminescence spectra of bulky semi conductors. The quantum yield from these states is low because of high values of effective radii of exciton. In ad dition, at ambient temperature excitons actively decom pose because of thermal motion. The energy of an exciton * Dedicated to the Academician of the Russian Academy of Sciences I. P. Beletskaya on the occasion of her anniversary.

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“…25 This method al lows one to prepare stable aqueous colloidal solutions of CdS nanoparticles without using toxic organic solvents and makes it possible to avoide additional laborious manipulations related to the solubilization.…”

Section: Methodsmentioning

confidence: 99%

Structure of cadmium sulfide nanoparticle micelle in aqueous solutions

2013

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The structure of cadmium sulfide (CdS) micelle in stable aqueous solution of ethylenedi aminetetraacetic acid was determined by dynamic light scattering, small angle X ray scattering and neutron scattering. The micelle aggregate is a single CdS nanoparticle with an average size of about 3 nm, the nanoparticle organic shell and the solvation shell are about 1 nm and 5 nm thick, respectively. These parameters were confirmed by the scanning semi contact atomic force microscopy and powder X ray diffraction studies of dry micelle cores isolated by high speed centrifugation. The CdS micelle was correctly described by a simple double shell model and was found to possess the structure corresponding to CdS quantum dots.Key words: cadmium sulfide, chemical condensation from aqueous solutions, micelle structure.Cadmium sulfide (CdS) nanoparticles and quantum dots (QD) are intensively studied because they possess unique catalytic and luminescent properties. 1-4 Cadmi um sulfide nanoparticles which are slightly larger in size than the exciton Bohr radius (3 nm) can be used in cataly sis for production of hydrogen, 5,6 for the purification of water from organic impurities, 7,8 and in organic syn thesis. 9 Cadmium sulfide nanoparticles whose size is equal or smaller than the exciton Bohr radius in bulk CdS, i.e., CdS QD, are a promising material for the design of robust fluorescent biosensors, 10,11 solar cells, 12 and lasers. 13 In the last twenty five years, procedures for the syn thesis of nanoparticles and colloidal QD were developed for many chalcogenides. The results on the synthesis of CdS nanoparticles and QD with various sizes and proper ties can be found in the literature. 14-21 The main restrain ing factor for the fundamental studies and practical appli cation of CdS nanoparticles is the toxicity of both cad mium ions 22,23 and organic compounds used presently for the synthesis and stabilization of nanoparticles. 17,20 Replacement of cadmium by nontoxic zinc, though being attractive for environmental reasons, has a fundamental disadvantage related to a too wide forbidden band of zinc sulfide (3.68 eV); the blue shift can only broaden it. 24 This leads to a shift of the absorption band to the UV region. Therefore, QD based on zinc sulfide cannot be used in many topical applications dealing with biology, medicine, and visible light photocatalysis. Replacement of CdS by silver and tin sulfides having narrower forbidden band is principally possible, but requires conducting of expensive preliminary quests and searches. However, all the alterna tive metals considered do not solve another important problem, viz., the toxicity of the organic stabilizing media.A possible way to solve this problem is to synthesize nanoparticles in nontoxic aqueous media. However, CdS is a hydrophobic compound; therefore, its synthesis di rectly in the aqueous solution is accompanied by intense agglomeration. These processes lead not only to coagula tion (sticking together), but also coalescence (a multiple increase in size) of nanoparticles. ...

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Preparation of stable colloidal solution of cadmium sulfide CdS using ethylenediaminetetraacetic acid

Cited by 33 publications

References 12 publications

Sizes and fluorescence of cadmium sulfide quantum dots

Sizes and fluorescence of cadmium sulfide quantum dots

Hybrid nanoparticles based on sulfides, oxides, and carbides

Structure of cadmium sulfide nanoparticle micelle in aqueous solutions

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