Spectral and luminescent properties of ZnO–SiO<sub>2</sub> core–shell nanoparticles with size-selected ZnO cores

Raevskaya, A. E.; Panasiuk, Ya. V.; Stroyuk, A. L.; Kuchmiy, Stepan Ya.; Dzhagan, Volodymyr; Milekhin, A. G.; Yeryukov, Nikolay A.; Sveshnikova, L. A.; Rodyakina, E. E.; Plyusnin, Victor F.

doi:10.1039/c4ra07959k

Cited by 55 publications

(28 citation statements)

References 39 publications

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“…The absorbance spectra of ZnO-SiO 2 before and after heat treatment are shown in figure 4. From the spectra, it can be seen that ZnO-SiO 2 showed the characteristic of SPR peak at around 364 nm and also a broad band at wavelength around 550-600 nm [35,36]. This result is in good agreement with thus obtained by Bajpai et al [34] who found that ZnO nanoparticles exhibit a SPR peak around 364 nm.…”

Section: Resultssupporting

confidence: 89%

Optical studies of crystalline ZnO–SiO₂ developed from pyrolysis of coconut husk

Anuar

Fen

Zaid

et al. 2020

Mater. Res. Express

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In this paper, the ZnO-SiO 2 was synthesized using ZnO nanopowders and SiO 2 developed from coconut husk ash by using conventional solid state method. The ZnO-SiO 2 crystal system was heattreated and the properties was studied. The XRD results showed high intensity peaks due to its high crystallinity when sintered at high temperature. The morphological differences can also be observed through FESEM images as the heat-treated crystal system showed well-distinct boundaries. Meanwhile, the absorbance intensity decreased and shifted to the lower wavelength after heat-treated. The optical band gap value of the ZnO-SiO 2 was 3.22 eV before treated and increased to 4.05 eV after heat treated. The presented results showed good properties of zinc silicate and it has a great potential as phosphors in optical application.

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Section: Resultssupporting

confidence: 89%

Optical studies of crystalline ZnO–SiO₂ developed from pyrolysis of coconut husk

Anuar

Fen

Zaid

et al. 2020

Mater. Res. Express

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“…FTIR spectra of ZnO nanocluster and SiO x /ZnO heterostructure in the spectral range of 400 to 1500 cm −1 shown in Figure 5 consisted of several bands at 420, 610, 738, 819 and 1109 cm −1 . The peak at 420, 610 and 738 cm −1 indicates the presence of ZnO which is in good agreement with the results obtained by XRD and attributed to the stretching vibration mode and also be related to the influence of shell induced strain and the appearance of ZnO bond between Zn and O atoms of the shell [33]. The spectra also show the bending vibration of Si▬O▬Si at 819 cm −1 indicating the bonding between the substrate and SiO x .…”

Section: Zno Nanoclustersupporting

confidence: 88%

Effect of Annealing on Metal-Oxide Nanocluster

Singh¹,

Rajkumari²

2019

Concepts of Semiconductor Photocatalysis

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Recently, the development of optoelectronic devices based on metal-oxide nanocluster has attracted intensive research interest. Nanoclusters are suitable for these because of their large surface-to-volume ratio and the presence of abundant oxygen vacancies or trap states. Metal-oxides such as ZnO, In 2 O 3 , and TiO 2 synthesized using different technique produces high surface area films consisting of clusters and provides complete control over the film morphology. In this chapter, some of the metal oxides nanocluster film has investigated, and the effect of annealing on the structural, optical and electrical properties of the grown films when subjected to different annealing temperatures will be studied. Theoretically, these properties are presumed to improve after the heat treatment as the crystallinity, and the grain size of the film has increased due to the diminishing of oxygen vacancies. Thus, the greater surface-to-volume ratio, the better stoichiometry and higher level of crystallinity compared to bulk materials make nanocluster-based devices very promising for the mentioned application.

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“…4-c. The peak at about 970 cm- Shastri et al 2013;Raevskaya et al 2014). Also, another peak shows Si-O, Zn-O, Si-O-Si, O-H band on nanocomposite that emerge at all ratio of nanocomposite.…”

Section: Fig 3 -Ftirmentioning

confidence: 89%

Hydrogen Sulfide Removal Using Various Metal Oxide Nanocomposite from Drilling Fluid: Optimization, Kinetic and Adsorption Isotherms

Nemati¹,

Saboori²,

Sabbaghi³

2019

Preprint

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In a drilling operation, the existing hydrogen sulfide in oil and gas reservoirs can be solved in drilling fluid and cause some environmental problems and life-threatening situations to personnel. Therefore, hydrogen sulfide removal of drilling fluid is so important. In this work, in order to hydrogen sulfide removal from drilling fluid, zinc oxide nanoparticle, silica nanoparticle and silica/zinc oxide nanocomposite with different ratio were synthesized by precipitation and sol-gel method and characterized by x-ray diffraction, fourier-transform infrared spectroscopy, Field emission scanning electron microscopy, energy dispersive x-ray and brunauer–emmett–teller. The Design Expert software, I-optimal, was used to design the experiments and the optimum condition for hydrogen sulfide removal was determined. Also, the effect of nanomaterial concentration, hydrogen sulfide concentration, contact time, pH and type of nanomaterial on removal of hydrogen sulfide was investigated. the results show, the optimization of removal at nanoparticle concentration, 0.1 and 0.9 wt.%, hydrogen sulfide concentration, 800 ppm, contact time, 3 min., pH, 12 and ZnO/SiO2 nanocomposite with 3:1 ratio is about 92.6 and 97.2%. investigation of the reaction kinetic showed that hydrogen sulfide removal had a very high rate, so that time parameter has a low impact on the removal process. Also, the kinetic adsorption was pseudo-first order. Adsorption of hydrogen sulfide followed Freundlich isotherm model and multilayer adsorption. The reusability of nanocomposite is four cycles for hydrogen sulfide removal more than 50%, which was significant in industrial processes.

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Spectral and luminescent properties of ZnO–SiO₂ core–shell nanoparticles with size-selected ZnO cores

Abstract: Deposition of a SiO2 shell on luminescent ZnO nanoparticles in dimethylsulfoxide precisely tunes the nanoparticle size from 3 to 6 nm.

Cited by 55 publications

References 39 publications

Optical studies of crystalline ZnO–SiO₂ developed from pyrolysis of coconut husk

Optical studies of crystalline ZnO–SiO₂ developed from pyrolysis of coconut husk

Effect of Annealing on Metal-Oxide Nanocluster

Hydrogen Sulfide Removal Using Various Metal Oxide Nanocomposite from Drilling Fluid: Optimization, Kinetic and Adsorption Isotherms

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Spectral and luminescent properties of ZnO–SiO2 core–shell nanoparticles with size-selected ZnO cores

Abstract: Deposition of a SiO2 shell on luminescent ZnO nanoparticles in dimethylsulfoxide precisely tunes the nanoparticle size from 3 to 6 nm.

Cited by 55 publications

References 39 publications

Optical studies of crystalline ZnO–SiO2 developed from pyrolysis of coconut husk

Optical studies of crystalline ZnO–SiO2 developed from pyrolysis of coconut husk

Effect of Annealing on Metal-Oxide Nanocluster

Hydrogen Sulfide Removal Using Various Metal Oxide Nanocomposite from Drilling Fluid: Optimization, Kinetic and Adsorption Isotherms

Contact Info

Product

Resources

About

Spectral and luminescent properties of ZnO–SiO₂ core–shell nanoparticles with size-selected ZnO cores

Optical studies of crystalline ZnO–SiO₂ developed from pyrolysis of coconut husk

Optical studies of crystalline ZnO–SiO₂ developed from pyrolysis of coconut husk