Structural and optical properties of silica capped ZnS:Mn quantum dots

Kumar, Sunil; Jeon, H. C.; Kang, Tae Won; Singh, Rajan; Sharma, Jyoti; Choubey, Ravi Kant

doi:10.1007/s10854-015-2928-0

Cited by 21 publications

(3 citation statements)

References 31 publications

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“…The absorption peaks found at 1398, 1425, and 1444/cm in control, T1, and T2 respectively, could be due to formation of BaCO 3 after CO 2 absorption by BaO sample from atmosphere [41]. Besides, IR spectra of ZnS powder is illustrated in Figure 8, in which absorption peaks observed at 592/ cm (control), 617/cm (T1) and 590/cm (T2) that were assigned to Zn-S stretching vibrations [42,43]. It indicates that absorption peaks were changed in treated sample as compared to control, which could be due to alteration in Zn-S bond length after biofield treatment.…”

Section: Ft-ir Analysismentioning

confidence: 94%

Influence of Biofield Treatment on Physical and Structural Characteristics of Barium Oxide and Zinc Sulfide

Trivedi¹,

Tallapragada²,

Branton³

2015

J Laser Opt Photonics

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Section: Ft-ir Analysismentioning

confidence: 94%

Influence of Biofield Treatment on Physical and Structural Characteristics of Barium Oxide and Zinc Sulfide

Trivedi¹,

Tallapragada²,

Branton³

2015

J Laser Opt Photonics

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“…It is broadly assumed that the excitation occurs through the host lattice and is followed by energy transfer to the impurity to produce the Mn luminescence band in Mn 2+ -doped ZnS quantum dots. Moreover, it was found that the luminescence properties of Mn:ZnS QDs synthesized by various procedures have a good correlation with the synthetic conditions [20][21][22][23].…”

Section: Introductionmentioning

confidence: 95%

Synthesis, optical and fluorescence properties of Mn-doped ZnS Quantum Dots

et al. 2020

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ZnS and 3 at% Mn:ZnS QDs were prepared by the hydrothermal method. The samples were characterized by XRD, FT-IR, SEM, TEM, EDX, UV-Vis spectroscopy, and photoluminescence (PL). The UV-Vis spectroscopy data showed that the peaks of the prepared ZnS and Mn:ZnS samples display a hypsochromic shift compared to that of the bulk ZnS. The calculated band-gap energy values of the ZnS and Mn:ZnS QDs are found to be 4.85 and 4.3 eV, respectively, and larger than that of bulk ZnS (3.68 eV) owing to strong quantum confinement. The calculated particle sizes from bandgap energies are found to be 1.8 nm and 1.7 nm for ZnS and Mn:ZnS, respectively. The PL measurements showed that the emission intensity of ZnS QDs increased by Mn 2+ doping. The fluorescence quantum yield (FLQY) of ZnS and 3 at% Mn:ZnS QDs is found to be 0.86 and 0.85, respectively. The incident photon-to-electron conversion efficiency (IPCE) measurement was performed to investigate the photovoltaic properties of ZnS and 3 at% Mn: ZnS QDs. At 370 nm, the measured IPCE (%) values are found to be 1.2% and 2.1% for ZnS and Mn:ZnS, respectively, suggesting that the Mn 2+ dopant enhances the optical properties of the host crystal (ZnS QDs).

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“…In addition, the particle size for the synthesized ZnS NPs can be calculated using Brus's equation (Equation ( 3)) [48,49].…”

Section: Sem Analysismentioning

confidence: 99%

Garlic Extract-Mediated Synthesis of ZnS Nanoparticles: Structural, Optical, Antibacterial, and Hemolysis Studies

Alnehia

Al-Odayni

Al-Hammadi

et al. 2023

Journal of Nanomaterials

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The green synthesis of zinc sulfide nanoparticles (ZnS NPs)-mediated plant extract is gaining importance because of its simplicity, cost-effectiveness, and ecofriendly nature. In this work, ZnS NPs were synthesized using garlic extract as NPs facilitating agent, characterized by Fourier transform infrared, X-ray diffraction, scanning electron microscope, and UV–visible, then their antibacterial and hemocompatibility were assayed. Analysis revealed a cubic phase, 2.33 nm crystallite size, and a 3.75 eV optical bandgap. Bioactivity test against Staphylococcus aureus and Escherichia coli indicated dose-dependent potency closer to that of azithromycin standard drug and more efficient on S. aureus (Gram-positive) than E. coli (Gram-negative) bacteria. Biocompatibility test in terms of erythrocyte hemolysis, in reference to normal saline and water as minimal and maximal controls, confirmed nontoxic substance up to 100 μg/mL as the highest examined concentration and at which a lysis of 2.9% was detected. Therefore, it could be concluded that this biogenic method is effective in producing ZnS NPs with desirable properties for potential biomedical applications.

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Structural and optical properties of silica capped ZnS:Mn quantum dots

Cited by 21 publications

References 31 publications

Influence of Biofield Treatment on Physical and Structural Characteristics of Barium Oxide and Zinc Sulfide

Influence of Biofield Treatment on Physical and Structural Characteristics of Barium Oxide and Zinc Sulfide

Synthesis, optical and fluorescence properties of Mn-doped ZnS Quantum Dots

Garlic Extract-Mediated Synthesis of ZnS Nanoparticles: Structural, Optical, Antibacterial, and Hemolysis Studies

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