Control of valence states for ZnS by triple-codoping method

Yamamoto, Tetsuya; Kishimoto, S.; Iida, S.

doi:10.1016/s0921-4526(01)00842-0

Cited by 157 publications

(77 citation statements)

References 11 publications

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“…16,17 Thus, one of the most important goals in modern materials research is the development of simple and low cost methods for large scale synthesis, as well as an understanding of the structure, shape and density of defects generated by the method employed.…”

Section: -13mentioning

confidence: 99%

Towards controlled synthesis and better understanding of blue shift of the CaS crystals

et al. 2014

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For the first time, the calcium sulfide (CaS) photoluminescent (PL) emission blue shift synthesized by the microwave-assisted solvothermal (MAS) method was examined to understand its key role in the PL activity. PL emission in the visible region showed a blue shift with synthesis time variations. In addition, we also investigated the electronic structure using first-principles calculations based on density functional theory (DFT) which was applied to periodic models at the B3LYP level. Two models were selected to simulate the effects of structural deformation on the electronic structure: (1) the ordered model (o-CaS) and (2) the disordered model (d-CaS). This PL emission shift is linked to distortions and defects which generate modifications in the electronic states and facilitate the possibility of numerous decay transactions to the valence band (VB).

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Section: -13mentioning

confidence: 99%

Towards controlled synthesis and better understanding of blue shift of the CaS crystals

et al. 2014

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“…Its non-toxic nature and unique optical properties continue to increase its wide variety of applications [10]. Typical examples are in flat-panel displays, electroluminescence devices, IR windows [11,12], sensors, lasers, and ultraviolet-emitting diodes [13,14]. Due to its non-toxicity, zinc sulphide is now used in waste water treatment as a photocatalyst in the degradation of organic pollutants such as dyes, halogenated derivatives, and pnitrophenol [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone

Onwudiwe

Krüger

Jordaan

et al. 2014

Applied Surface Science

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Research Highlights-Zinc sulphide (ZnS) nanoparticles were synthesised by laser irradiation -The structural and morphological properties of the prepared samples were analysed -Larger particles were obtained by using Na 2 S instead of TAA as the sulphur source.-Phonon softening and line broadening of the peaks were observed -Size reduction occurred in the samples obtained from both sources Graphical Abstract AbstractZinc sulphide (ZnS) nanoparticles have been synthesised by a green approach involving laser irradiation of an aqueous solution of zinc acetate (Znac 2 ) and sodium sulphide (Na 2 S·9H 2 O) or thioacetamide (TAA) in polyvinylpyrrolidone (PVP). The structural and morphological properties of the prepared samples were analysed using a transmission electron microscope, TEM, a high resolution transmission electron microscope, HRTEM, X-ray diffraction, and Raman spectroscopy.The thermal properties were studied using a simultaneous thermal analyser (SDTA). Better dispersed and larger particles were obtained by using sodium sulphide (Na 2 S) instead of TAA as the sulphur source. X-ray diffraction (XRD) analyses and Raman measurement show that the particles have a cubic structure, which is usually a low temperature phase of ZnS. There were phonon softening and line broadening of the peaks which are attributed to the phonon confinement effect. The average crystallite size of the ZnS nanoparticles estimated from the XRD showed a reduction in size from 13.62 to 10.42 nm for samples obtained from Na 2 S, and 9.13 to The absorption spectra showed that the nanoparticles exhibit quantum confinement effects.

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“…2 It has a wide range of applications for flat-panel displays, optical sensors, IR windows, catalysts, lasers, etc. [3][4][5] Shape and structure are crucial factors in determining the chemical, optical, and electrical properties of these materials. 6,7 Thus, one of the most important goals of modern materials research is the development of simple chemical methods for large scale synthesis of nanomaterials with full control of defects and morphology and, in this context, a considerable variety of methods has been reported for the synthesis of ZnS nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical studies on the enhanced photoluminescence activity of zinc sulfide with a capping agent

Santana

Raubach

Ferrer

et al. 2011

Journal of Applied Physics

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The photoluminescence (PL) emission from zinc sulfide (ZnS) synthesized by the microwave-assisted solvothermal method in the presence/absence of a capping agent was examined to understand the key role of its PL activity. In addition, we also investigated the electronic structure using a first-principle calculation based on density functional theory (DFT) applied to periodic models at BÁLYP level. Two models were selected to simulate the effects of structural deformation on the electronic structure; the ordered o-ZnS model and the disordered d-ZnS model, dislocating the Zn atom, 0.1 Å , in the z-direction. The PLemission in the visible region showed different peak positions and intensities in capped and uncapped ZnS. The PL emission was linked to distinct distortions in lattices and the emission of two colors, green in the capped and blue in the uncapped, was also examined in the light of favorable structural and electronic conditions. The computational simulations indicate that the electronic behavior can be associated with the new electronic levels above the valence band.

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Control of valence states for ZnS by triple-codoping method

Cited by 157 publications

References 11 publications

Towards controlled synthesis and better understanding of blue shift of the CaS crystals

Towards controlled synthesis and better understanding of blue shift of the CaS crystals

Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone

Experimental and theoretical studies on the enhanced photoluminescence activity of zinc sulfide with a capping agent

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