Technique of synthesis and optical properties of CdS/polymethylmethacrylate nanocomposites

Biryukov, A. A.; Izaak, T. I.; Svetlichnyi, V. A.; Babkina, O. V.

doi:10.1007/s11182-006-0265-8

Cited by 14 publications

(7 citation statements)

References 8 publications

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“…We note that the macromolecules of transparent PMMA are capable of stabilizing the CdS nanoparticles synthesized in the medium of the MMA monomer, and their size depends on the molecular mass of the polymer [153]. The nanodimensional CdS is capable of initiating the polymerization of vinyl monomers under the influence of UV light.…”

Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 91%

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Ishchenko

Grabchuk

2009

Theor Exp Chem

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The main factors affecting the degradation of dyed polymeric matrices by the action of light (conversion of light energy into thermal energy, electron phototransfer, population of triplets, aggregation of dyes, oxidation-reduction processes, interaction with oxygen, including singlet) are analyzed and classified. Their dependence on the structure of the dyes, the nature of the polymer, and the method of dyeing of the latter is examined. Criteria for the creation of lightfast dyed matrices are formulated. Special attention is directed to contemporary light-sensitive materials in which the dye is covalently bonded to the polymer and to organic-inorganic compositions based on them.Dyed polymers are widely used in laser technology [1][2][3][4][5], media for writing and recording data [6-8], solar power [9][10][11][12], and optoelectronics [12][13][14][15]. Such polymeric materials have a series of operational advantages over dyed liquid materials on account of their more simple and more convenient construction, non-toxicity, and the possibility of working over a wide temperature range (from minus to plus temperatures) and under conditions of weightlessness. However, these advantages can only be realized to the full extent in the solution of various applied problems if dyed matrices with sufficient stability to the action of light are created. The aim of the present review was therefore to analyze, classify, and generalize methods of creating such matrices. FACTORS GIVING RISE TO THE DEGRADATION OF DYED POLYMERS DURING THE ACTION OF LIGHTThe presence of absorbing microimpurities that are heated by radiation are responsible for the radiation damage of optically transparent polymers. Purification from such inclusions at the monomer stage leads to a substantial increase in the threshold of radiation damage in the obtained polymer. For instance, the purification of methylmethacrylate (MMA) by repeated slow distillation raises this threshold of polymethylmethacrylate (PMMA) from several times [16] to two orders of magnitude [17]. 0040-5760/09/4503-0143

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Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 91%

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Ishchenko

Grabchuk

2009

Theor Exp Chem

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“…In [15] it was demonstrated that macromolecules of optically transparent polymer -polymethylmethacrylate (PMMA) -can stabilize cadmium sulfide nanoparticles synthesized in a methylmethacrylate (MMA) medium. Moreover, the rate of particle aggregation depends on the molecular mass of the polymer: PMMA molecules with short chains have higher stabilizing ability.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This step makes the procedure of synthesis much more expensive and calls for evaporation of the initial solvent not always possible without influencing the QD properties. Therefore, the development of one-step procedure of size-controlled synthesis of dispersions from particles of chalcogenides of transitive metals in acryl monomers is an urgent problem.In [15] it was demonstrated that macromolecules of optically transparent polymer -polymethylmethacrylate (PMMA) -can stabilize cadmium sulfide nanoparticles synthesized in a methylmethacrylate (MMA) medium. Moreover, the rate of particle aggregation depends on the molecular mass of the polymer: PMMA molecules with short chains have higher stabilizing ability.…”

mentioning

confidence: 99%

“…Moreover, the rate of particle aggregation depends on the molecular mass of the polymer: PMMA molecules with short chains have higher stabilizing ability. A method of one-step, size-controlled synthesis of CdS/PMMA nanocomposites was suggested in [15].At the same time, it is well known that nanoscale cadmium sulfide, like other A 2 B 6 semiconductors, can initiate the reaction of vinyl series monomer polymerization under irradiation [16]. The polymerization mechanism involves interaction of electrons and holes formed under irradiation on the cadmium sulfide surface with monomer molecules resulting in the formation of radicals and ions-radicals that initiate polymerization.…”

mentioning

confidence: 99%

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Optical properties of CdS/MMA dispersions and CdS/PMMA nanocomposites prepared by one-step, size-controlled synthesis

et al. 2011

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Results of investigations into the optical properties of semiconductor quantum dots (including absorption, fluorescence, and nonlinear scattering) in CdS/MMA dispersions and CdS/PMMA composites prepared by one-step, size-controlled synthesis in a monomer medium are presented. It is demonstrated that selective optical excitation during synthesis of CdS nanoparticles in the monomer medium allows the particle sizes to be controlled. It is demonstrated that changes of the sulfur/cadmium ratio in the reaction mixture influence significantly the fluorescent properties of particles. Nonlinear scattering of the synthesized media is investigated, and it is revealed that scattering in optically homogeneous composites is much weaker than in dispersions where agglomerates with sizes up to 100 nm are presented.Keywords: quantum dots, size-controlled synthesis, CdS/MMA nanoparticle dispersions, CdS/PMMA nanocomposite, spectral and luminescent properties, nonlinear scattering. INTRODUCTIONThe media comprising quantum dots (QD) of A 2 B 6 semiconductors belonging to chalcogenides of transitive metals are unique materials whose optical properties depend on the nanoparticle sizes and shapes [1][2][3]. Nowadays QD find application as fluorescent labels in biological media [4,5] and bio-and chemical sensors [6,7] substituting for other materials, in particular, fluorescent organic dyes, because they have higher photostability, radiation efficiency [5], and sensitivity in comparison with these materials.Other promising directions of QD application in optical technologies are their application as active elements of solar cells [8] and amplifying [9] and nonlinearly absorbing media [10] and components of media for multiphoton microstereolithography increasing nonlinear susceptibility during synthesis and providing unique fluorescent properties of synthesized 3D microstructures [11]. Of practical interest for these applications are solid hybrid materials comprising organic (polymer matrix) and inorganic components (nanoscale particles). In most cases, these materials are synthesized in several steps. QD dispersions are first prepared in an organic solvent, and then QD are transferred to a monomer medium [12][13][14]. This step makes the procedure of synthesis much more expensive and calls for evaporation of the initial solvent not always possible without influencing the QD properties. Therefore, the development of one-step procedure of size-controlled synthesis of dispersions from particles of chalcogenides of transitive metals in acryl monomers is an urgent problem.In [15] it was demonstrated that macromolecules of optically transparent polymer -polymethylmethacrylate (PMMA) -can stabilize cadmium sulfide nanoparticles synthesized in a methylmethacrylate (MMA) medium. Moreover, the rate of particle aggregation depends on the molecular mass of the polymer: PMMA molecules with short chains have higher stabilizing ability. A method of one-step, size-controlled synthesis of CdS/PMMA nanocomposites was suggested in [15].At the same time, ...

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Preparation of II–VI Semiconductors Nanoparticles and Investigation of Their Photophysical Properties

Nassar

Osipova

Сафиуллин

et al. 2011

International Journal of Green Nanotechnology

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Technique of synthesis and optical properties of CdS/polymethylmethacrylate nanocomposites

Cited by 14 publications

References 8 publications

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Optical properties of CdS/MMA dispersions and CdS/PMMA nanocomposites prepared by one-step, size-controlled synthesis

Preparation of II–VI Semiconductors Nanoparticles and Investigation of Their Photophysical Properties

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