Stabilized blue emitting ZnS@SiO2 quantum dots

Rodriguez, Gerardo; Carrillo-Torres, R. C.; Zeferino, Raúl Sánchez; Ramos, Mario

doi:10.1016/j.optmat.2019.01.057

Cited by 14 publications

(23 citation statements)

References 27 publications

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“…Once the silica has formed, the ZnS nanoparticles must remain fixed and isolated from each other, avoiding the quenching of their optical properties in addition to their environmental degradation. 21 The ratio of TEOS with respect to zinc precursor was estimated based on the expected volume of products; the evaluated ratios were 1:1, 1:2, 1:3, and 1:5. The best results were obtained using the ratio of 1:3; given that when the silica thickness was thinner, the material did not withstand the heating, and when it was too big, the optical properties were not adequate.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In the SEM image, at low magnification it is possible to observe that the material is constituted by agglomerated quasispherical-shaped nanoparticles with size below the 100 nm of diameter, while the TEM image at higher magnification shows that the material is formed by at least two different density materials that must be ZnS nanoparticles embedded into a silica matrix as we previously reported. 21 Although the silica exhibits an amorphous shape, the spherical ZnS nanoparticles are embedded into the matrix. In addition, Figure S1 shows an HRTEM micrograph which depicts the size and shape of the particles with more details, the electron diffraction pattern, and EDS spectrum of the sample.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…41 On the one hand, with just the covering process of the ZnS nanoparticles with silicon dioxide the formation of different zinc compounds at the interaction zone of both materials occurred and was previously analyzed and reported. 21 On the other hand, their evolution against temperature has been followed by tracking the intensity rate of both main components that exhibit evidence of the gradual transformation from ZnS to ZnSiO 4 as the temperature increases.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Silica-Coated ZnS Quantum Dots for Multicolor Emission Tuning from Blue to White Light

Rodriguez

Sánchez-Zeferino

González

et al. 2021

ACS Appl. Nano Mater.

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The present work reports the easy tunability from blue to cold-white light emission of ZnS quantum dots embedded into a silica matrix (ZnS@SiO 2 ) by simple heating treatments (up to 900 °C) without the need of rare earth or heavy metal ion doping. The heating causes gradual changes in the composition of samples, such as crystallization of cristobalite and formation of zinc silicate, whose optical properties contribute to the tunability of the material. The evolution of the induced changes in the shape and structure was followed by scanning electron microscopy, Xray diffraction, X-ray photoelectron spectroscopy, and Raman and Fourier transformed infrared spectroscopies. Diffuse reflectance and photoluminescence spectroscopies were used to analyze the optical properties of the obtained materials, exhibiting that as-synthesized ZnS@SiO 2 nanoparticles have an intense and wide blue emission band centered around 440 nm under 325 nm excitation, which is modified by the temperature with the enhancement of the intensity and widening of the band emission, as well as maximum shifting. The calculations of the CIE 1931 chromaticity coordinates show the tuning of the precepted tonality of the emission color from ocean-blue (0.18, 0.14) up to blue-sky (0.20, 0.31) and cold white light (0.27, 0.33) with a correlated color temperature of 12 500 and 7400 K for the last two. Besides suitable and facile tuning of the color emission, the thermal treatment of samples increases the stability of each one allowing their long-term usage as emitting devices.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Silica-Coated ZnS Quantum Dots for Multicolor Emission Tuning from Blue to White Light

Rodriguez

Sánchez-Zeferino

González

et al. 2021

ACS Appl. Nano Mater.

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“…For instance, the SiO2-coated zinc based nanoparticles (e.g. ZnSe/ZnS/SiO 2 [11], ZnS: Mn/SiO 2 [12], Mn/ZnS@SiO 2 -NH 2 [13] and ZnS/SiO 2 [14]) were prepared by the Stober method. Up to now, to the best of our knowledge, the synthesis of SiO 2 -coated Agdoped ZnS nanoparticles (i.e.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ZnSe: Ag/SiO₂ nanoparticles

Huang

et al. 2021

E3S Web Conf.

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Argentum-doped zinc selenide/silicon dioxide nanoparticles (expressed as ZnSe: Ag/SiO2) were synthesized by Stöber method. The structure, morphology and fluorescence properties of the quantum dots were characterized by X-ray powder diffraction, transmission electron microscopy, infrared spectrum, ultraviolet-visible spectrum and fluorescence spectrum. The results show that the as-prepared ZnSe: Ag/SiO2 nanoparticles are spherical, most of which are about 30 nm in size, and have good fluorescence properties. Compared with that of ZnSe: Ag nanoparticles, the stability of ZnSe: Ag/SiO2 nanoparticles is enhanced obviously. The ZnSe: Ag/SiO2 nanoparticles will have potential applications in biological fluorescence analysis.

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“…In recent years, zinc supplied (ZnS) NPs have been subjected due to their extensive range applications and versatile characterizations such as large surface to volume ratio as well as quantum confident effects. Recent findings revealed various exquisite optical, physical and chemical properties of ZnS that are utilized extensively in various scopes of technology such as solar window layers, IR windows [1], flat panel display [2], electro-optics, photoconductors and electroluminescence [3], UV diodes [4]. Many researchers are devoted to expanding the novel fabrication method to synthesize nanostructure composites.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity, nanostructure and optical properties of 3D ZnS urchin-like via hydrothermal method

Riazian

Yousefpoor

2020

International Journal of Smart and Nano Materials

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In the present research, the fabrication and characterization of ZnS urchin-like nanoparticles (ULNPs) via simple, template free and onestep hydrothermal method are reported. Zinc acetate dihydrate, thiosemicarbazide and ethylenediamine are utilized as precursors. Nanostructure characterization of three-dimension ZnS ULNPs is specified by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and ultraviolet-visible (UV-Vis) spectroscopy. The photocatalytic activity of ZnS NPs is determined by measuring the degradation of an organic dye methylene orange (MO) under UV-irradiation. The lattice characteristics such as nanocrystallite size, strain, stress, and deformation energy density are specified using Williamson-Hall (W-H) and Halder-Wagner (H-W) analysis with different considerations about the isotropic nature of the crystal. XRD analysis reveals that ZnS NPs are hexagonal wurtzite phase. The shape and mean diameter of NPs are demonstrated by TEM and SEM techniques to be 3D urchin-like with an average size of 60 nm. N2 adsorption-desorption and UV-Vis spectroscopies are utilized to specify the optical characteristics such as mean pore diameter, total pore size, and BET special surface area. The band gap of fabrication ZnS NPs has been evaluated from the Tauc equation and absorption edge to be 3.84 eV.

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Stabilized blue emitting ZnS@SiO2 quantum dots

Cited by 14 publications

References 27 publications

Silica-Coated ZnS Quantum Dots for Multicolor Emission Tuning from Blue to White Light

Silica-Coated ZnS Quantum Dots for Multicolor Emission Tuning from Blue to White Light

Synthesis and characterization of ZnSe: Ag/SiO₂ nanoparticles

Photocatalytic activity, nanostructure and optical properties of 3D ZnS urchin-like via hydrothermal method

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Stabilized blue emitting ZnS@SiO2 quantum dots

Cited by 14 publications

References 27 publications

Silica-Coated ZnS Quantum Dots for Multicolor Emission Tuning from Blue to White Light

Silica-Coated ZnS Quantum Dots for Multicolor Emission Tuning from Blue to White Light

Synthesis and characterization of ZnSe: Ag/SiO2 nanoparticles

Photocatalytic activity, nanostructure and optical properties of 3D ZnS urchin-like via hydrothermal method

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Product

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Synthesis and characterization of ZnSe: Ag/SiO₂ nanoparticles