Synthesis, optical, structural and thermal characterization of Mn2+ doped ZnS nanoparticles using reverse micelle method

Murugadoss, Govindhasamy

doi:10.1016/j.jlumin.2011.03.048

Cited by 62 publications

(28 citation statements)

References 42 publications

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“…The effect of thermal treatments in vacuum was already described in Reference [29], by employing both XRD and TEM techniques. As reported elsewhere, thermal treatments in air of ZnS causes the transformation to ZnO [53][54][55]. This was confirmed on our samples by both activation in static oven and in N 2 /O 2 flow.…”

Section: Effect Of Synthesis and Post-synthesis Conditions On Crystalsupporting

confidence: 92%

Effect of Post-Synthesis Treatments on the Properties of ZnS Nanoparticles: An Experimental and Computational Study

Balantseva

Camino

Ferrari

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-This work deals with the characterization of ZnS NanoParticles (NP), prepared by precipitation employing thioacetamide as sulfur source at different reaction time length. The attention is focused on the modification induced on structural, surface and electronic properties of ZnS NP by post-synthesis treatments. These were aimed at removing from the samples surface adsorbed reactants, by washing or thermal treatments, both in air or vacuum. The effect of these parameters is followed by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Fourier Transform InfraRed (FTIR), gas-volumetric and ThermoGravimetric Analysis (TGA). Moreover, the effect of nanostructuration on the semiconducting material band gap is evaluated by Diffuse Reflectance UV-Vis (DR UV-Vis) spectroscopy. Density Functional Theory (DFT) calculations have been employed to clarify the role of the adsorbed reactants on the surface stability and to assess the relationship between particle size and band gap value.Résumé -Effet des traitements après-synthèse sur les propriétés de nanoparticules de ZnS : une étude expérimentale et computationnelle -Ce travail concerne la caractérisation de nanoparticules de ZnS préparées par précipitation en présence de ThioAcétAmide (TAA) comme source de soufre. On a étudié, en particulier, les modifications des propriétés structurelles, superficielles et électroniques en fonction des paramètres de synthèse (temps, solvant et source de soufre) et des traitements après-synthèse considérés. Ces derniers avaient pour but d'éliminer les réactifs adsorbés sur la surface par lavages ou traitements thermiques à l'air ou sous vide. L'effet des différents traitements a été suivi par diffraction des rayons X (XRD), microscopie de transmission électronique (TEM), spectroscopie infra rouge à transformée de Fourier (FTIR), analyse volumétrique des gaz et thermogravimétrie (TGA). En outre, l'effet de la nanostructure sur les propriétés de la largeur de bande du matériau semi-conducteur a été évalué par spectroscopie de reflectance UV-Vis (DR UV-Vis). Des théories de la fonctionnelle de la densité (DFT) ont été utilisées pour clarifier le rôle des réactifs adsorbés sur la stabilité de la surface et pour établir une relation entre la dimension des particules et la largeur de bande.

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Section: Effect Of Synthesis and Post-synthesis Conditions On Crystalsupporting

confidence: 92%

Effect of Post-Synthesis Treatments on the Properties of ZnS Nanoparticles: An Experimental and Computational Study

Balantseva

Camino

Ferrari

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…It clearly indicates the formation of crystalline silver cluster in the ZnO nanoparticles. When annealing above 200°C, the silver sulfide decomposes and only elemental silver is stable, and the remaining sulfur ions may be released as the form of SO 2 gas (Murugadoss 2011). The secondary products ZnO-Ag may be formed in air as given by the following equations: Figure 3a (i-iv) shows an interesting surface morphology for the as-prepared Ag 2 S/ZnS nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, optical, photocatalytic, and electrochemical studies on Ag2S/ZnS and ZnS/Ag2S nanocomposites

et al. 2015

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Novel Ag 2 S/ZnS and ZnS/Ag 2 S nanocomposites were synthesized by a simple chemical method in air. Different morphologies were obtained for Ag 2 S/ZnS nanocomposites annealed at different temperatures. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible absorption, and photoluminescence (PL) spectroscopy. Thermal stability and phase transition of the sample were studied by TG-DTA. Compared the PL spectra of Ag 2 S/ZnS at 640 nm, it was significantly red shifted from 640 to 670 nm for reversed ZnS/Ag 2 S nanocomposites. The band gaps of nanocomposites were lying between 2.25 and 2.55 eV range. It has been found that as-synthesized powder has excellent photocatalytic activity toward degradation of methylene blue (MB) under visible light and electrochemical activity, indicating that Ag 2 S/ZnS and ZnS/Ag 2 S nanocomposites can play an important role as semiconductor photocatalyst and energy storage applications.

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“…This reduction in particle size changes the optical properties due to a quantum confinement effect and surface effect of nanometre materials. This type of size variation process in semiconductor nanocrystals produces novel optical properties that appear due to quantum confinement effects that diverge notably with size . However, luminescence technology can be improved with the help of semiconductor nanoparticles that possess novel optical and electrical properties in comparison with bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Tuneable luminescence properties of EDTA‐assisted ZnS:Mn nanocrystals from a yellow‐orange to a red emission band

et al. 2017

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Luminescence technology has been improved with the help of semiconductor nanoparticles that possess novel optical and electrical properties compared with their bulk counterpart. The aim of this study was to design semiconductor nanocrystals in their pure (ZnS) or doped form (ZnS:Mn) with different concentrations of Mn ions by a wet chemical route stabilized by ethylenediamine tetra-acetic acid (EDTA) and to evaluate their luminescence properties. The nanocrystals were characterized by physicochemical techniques such as X-ray diffraction (XRD), High-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SEAD), EDS, and ultraviolet (UV)-visible light and photoluminescence (PL) studies. These results showed the presence of cubic phase and spherically shaped nanocrystals. A blue shift with respect to their bulk counterpart was observed. PL emission spectra were observed with a fixed blue peak and the yellow-orange bands were red shifted towards the red region under the same excitation wavelength. The orange-red bands were attributed to the radiation transition of electrons in 3d5 unfilled shells of Mn ions [ T ( G)- A ( S)]; the ZnS matrix varied with Mn concentration. Shift and increase in the intensity of the PL and absorption bands were observed with increase in Mn content. The study showed that Mn -doped ZnS nanocrystal emission bands can be tuned from the yellow-orange to the red regions under a controlled synthesis process and could be used as promising luminescent emitters in the biology field upon functionalization with suitable materials. Further studies on construction with various other materials will be useful for practical applications.

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Synthesis, optical, structural and thermal characterization of Mn2+ doped ZnS nanoparticles using reverse micelle method

Cited by 62 publications

References 42 publications

Effect of Post-Synthesis Treatments on the Properties of ZnS Nanoparticles: An Experimental and Computational Study

Effect of Post-Synthesis Treatments on the Properties of ZnS Nanoparticles: An Experimental and Computational Study

Synthesis, optical, photocatalytic, and electrochemical studies on Ag2S/ZnS and ZnS/Ag2S nanocomposites

Tuneable luminescence properties of EDTA‐assisted ZnS:Mn nanocrystals from a yellow‐orange to a red emission band

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