Optical properties of cadmium sulfide quantum dots in water solutions

Rempel, S. V.; Levin, A. D.; Sadagov, A. Yu.; Rempel, А. А.

doi:10.1134/s106378341506027x

Cited by 17 publications

(5 citation statements)

References 10 publications

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“…1 shows the luminescence spectra of solutions with different QD concentration. We note that from a certain concentration value the luminescence intensity increase is replaced by a slight decrease (similar dependence was observed in [10]). A decrease in fluorescence intensity with the concentration increase refers to a concentration quenching.…”

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confidence: 81%

On the impact of the laser radiation wavelength and the concentration of quantum dots on the luminescence spectra of colloid solution and QD-doped nanocomposites

et al. 2019

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The influence of the concentration and the laser excitation wavelength on the width and luminescence spectrum maximum of CdSe/CdS /ZnS quantum dots in the toluene solution and doped on the glass plate was studied. It was shown that the wavelength of the exciting laser does not affect the width and peak center of the luminescence spectrum of the samples under the study. Possible mechanisms of the quantum dots concentration influence on studied parameters are analyzed.

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confidence: 81%

On the impact of the laser radiation wavelength and the concentration of quantum dots on the luminescence spectra of colloid solution and QD-doped nanocomposites

et al. 2019

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“…At sufficiently high temperatures (about room temperature) and a strong exciton-phonon bond present in CdS because of the features of the exciton consisting of a heavy hole and a light electron, the peak becomes immersed in the broad absorption background [24,25]. In the optical absorption spectrum of the CdS nanoparticles, one usually observes a step related to the emergence of local levels formed by various defects inside the forbid den band [7,26,27]. In synthesized glass, one observes the shift of the absorption edge to the long wavelength range and the step emergence in the course of the nanoparticles' growth during the second stage of ther mal treatment (Fig.…”

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confidence: 99%

Formation of CdS nanoparticles in the matrix of silicate glass and its optical properties

et al. 2016

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CdS nanoparticles of an average diameter of ~2.7 nm have been synthesized in silicate glass by two stage heat treatment. As was demonstrated using the methods of spectrophotometry and luminescence in the ultra violet and visible optical ranges, semiconductor phase nuclei were formed at the first stage of thermal treatment, and they grew at the second stage. The image of the spatial distribution of CdS nanoparticles in the glass network has been obtained by computer simulation. The calculated pair distribution function revealed that the average dis tance between nanoparticles was ~15 nm, which appears sufficient to isolate them from each other in the dielec tric matrix and to ensure reliable confinement of electrons inside each nanoparticle.

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“…The fluorescence analysis showed an emission band at 450 nm in Biological MGYP, Biological DS, CdS-NPs MGYP, and CdS-NPs DS (Fig 1B ), which corresponds to some aromatic amino acids present in the proteins [27], as well as to the enzymatic cofactors NADH and NADPH released by the fungal biomass [28]. Nevertheless, only in CdS-NPs MGYP and CdS-NPs DS, did the fluorescence emitted at 450 nm decrease, and an emission band at 520 nm appeared (Fig 1B ), which corresponds to CdS-NPs formation [29], [30]. According to previous data and based on Hietzschold results [31], we can suggest that the oxidation of NADH and NADPH cofactors occurs due to their participation in the reduction processes of metal ions to synthesize the CdSNPs.…”

Section: Optical Characterization Of the Cdsnpsmentioning

confidence: 97%

Effect of Growth Medium of Fusarium Oxysporum in the Synthesis of Cadmium Sulfide Nanoparticles

Loa¹,

Pichardo-Molina²,

Calvo-Olvera³

et al. 2022

Proceedings of the 8th World Congress on New Technologies

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Fusarium oxysporum f. sp. lycopersici is a species reported to synthesize silver, gold, and cadmium nanoparticles when using biomass; it can produce and secrete many secondary metabolites hydrolytic enzymes involved in nanoparticle synthesis processes. However, the production of these components depends on the substrate where the fungus grows. The present work aims to evaluate the effect of the growth medium of Fusarium oxysporum in the synthesis of cadmium sulfide nanoparticles (CdS-NPs). The fungal biomass was obtained from a growth medium with nitrogenous components of higher and lower complexity (MGYP and DS respectively) and used for the synthesis of CdS-NPs using cadmium nitrate (Cd (NO3)2*4H2O) and elemental sulfur (S°). CdS-NPs exhibit two absorbance bands at 320 and 450 nm, with a fluorescence emission at 520 nm when excited with a wavelength at 365 nm. Transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction confirmed the presence of CdS-NPs with a mean diameter of 4.7 ± 0.7 and 4.9 ± 0.9 nm when MGYP and S media were used for biomass production, as well as atomic columns of CdS-NPs with A similar crystalline structure. However, it was also possible to appreciate fewer CdS-NPs when using the fungal biomass obtained from DS medium, which was confirmed by spectrophotometry through the absorption and emission bands at 450 and 520 nm.

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Optical properties of cadmium sulfide quantum dots in water solutions

Cited by 17 publications

References 10 publications

On the impact of the laser radiation wavelength and the concentration of quantum dots on the luminescence spectra of colloid solution and QD-doped nanocomposites

On the impact of the laser radiation wavelength and the concentration of quantum dots on the luminescence spectra of colloid solution and QD-doped nanocomposites

Formation of CdS nanoparticles in the matrix of silicate glass and its optical properties

Effect of Growth Medium of Fusarium Oxysporum in the Synthesis of Cadmium Sulfide Nanoparticles

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