Synthesis of ZnS Quantum Dots for QDs-LED hybrid device with different cathode materials

Mohammed, Ahmed F.; Salah, Wasan R.

doi:10.1088/1742-6596/1032/1/012010

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…The calculated lattice constant and lattice volume for pure and Fe doped ZnS have been tabulated in Table 1 compared with the others experimental results and theoretical calculations. From Table 1, it is observed that the calculated lattice constant is 0.07% and 2.44% that is larger than previously calculated experimental [59] and theoretical [44] values, respectively. Our optimization on pure ZnS shows a better approximation compared to the same obtained by others as shown in Table 1 w. r. to the calculated lattice volume.…”

Section: Resultsmentioning

confidence: 54%

Influence on structural, electronic and optical properties of Fe doped ZnS quantum dot: A density functional theory based study

Momin

Islam

Majumdar

2021

Int J of Quantum Chemistry

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In this paper, the tunability of the fluorescence capacity of ZnS quantum dot (QD) after the effective doping of transition metal iron (Fe) have been studied. The structural, electronic, and optical properties have been optimized for pure and Fe doped ZnS QDs by using local density approximation in density functional theory framework. The optimized lattice volumes show a reasonable agreement with previously obtained experimental and theoretical data for both the doped and un‐doped system. As Fe is doped to ZnS, the crystal system transforms from cubic to tetragonal structure with an increased lattice volume compared to the pure system and exhibits a narrow band gap with a negative value. Moreover, the absorption peak is broadened in the ultraviolet to the blue (visible) region and it shows a low intense peak in the infrared region. These results indicate the increase of fluorescence capacity that may be expected to apply for rapid detection of virus‐like as SARS CoV‐2.

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Section: Resultsmentioning

confidence: 54%

Influence on structural, electronic and optical properties of Fe doped ZnS quantum dot: A density functional theory based study

Momin

Islam

Majumdar

2021

Int J of Quantum Chemistry

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“…XRD analysis shows 3 specific peaks at 2θ almost equal to 29, 48, and 56° which are related to the reflection from (111), (220), and (311) sheets respectively, the typical pattern for ZnS QDs according to the literature [20] (Figure 1c). Having the Miller indices (h k l), lattice constants (i. e., the unit cell edges a, b, c) can be extracted from Equation 2:

\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr \ {{1}\over{{d}^{2}}}={{{h}^{2}}\over{{a}^{2}}}+{{{k}^{2}}\over{{b}^{2}}}+{{{l}^{2}}\over{{c}^{2}}}\hfill\cr}}

…”

Section: Resultsmentioning

confidence: 76%

“…Crystal structure XRD analysis shows 3 specific peaks at 2θ almost equal to 29, 48, and 56°which are related to the reflection from (111), (220), and (311) sheets respectively, the typical pattern for ZnS QDs according to the literature [20] (Figure 1c). Having the Miller indices (h k l), lattice constants (i. e., the unit cell edges a, b, c) can be extracted from Equation 2:…”

Section: X-ray Diffraction Analysismentioning

confidence: 80%

Exploring the Effects of Various Capping Agents on Zinc Sulfide Quantum Dot Characteristics and In‐vitro Fate

Montaseri,

Tamaddon,

Raee

et al. 2023

ChemistryOpen

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The choice of capping agents used during the synthesis process of quantum dots (QDs) can significantly influence their fate and fundamental properties. Hence, choosing an appropriate capping agent is a critical step in both synthesis and biomedical application of QDs. In this research, ZnS QDs were synthesized via chemical precipitation process and three commonly employed capping agents, namely mercaptoethanol (ME), mercaptoacetic acid (MAA), and cysteamine (CA), were used to stabilize the QDs. This study was aimed to examine how these capping agents impact the physicochemical and optical characteristics of ZnS QDs, as well as their interactions with biological systems. The findings revealed that the capping agents had considerable effects on the behavior and properties of ZnS QDs. MAA‐QD exhibited superior crystal lattice, smaller size, and significant quantum yield (QY). In contrast, CA‐QDs demonstrated the lowest QY and the highest tendency for aggregation. ME‐QDs exhibited intermediate characteristics, along with an acceptable level of cytotoxicity, rapid uptake by cells, and efficient escape from lysosomes. Consequently, it is advisable to select capping agents in accordance with the specific objectives of the research.

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“…[5] The optical properties of ZnS QDs can be tuned by size in the fabrication process. As a result, many researchers attempted to control their size during the synthesis DOI: 10.1002/crat.202200074 process by using different coating ligands, [6][7][8][9][10][11][12][13] varying the cationic surfactant, [14] changing the pH of the reaction solution, [15] or changing the ratio content of the Zn 2+ /S 2−[8, [16][17][18] or contents of the ligand. [19,20] So far, there is still little literature about the relationship between growth time and the average size of ligand-capped ZnS QDs.…”

Section: Introductionmentioning

confidence: 99%

Time‐Dependent Growth Rates of TGA‐Capped ZnS Nanocrystals as a Synthetic Formula for Ligand‐Capped Quantum Dots

Bui

Nguyễn

2022

Cryst. Res. Technol.

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ZnS quantum dots (ZnS QDs) are prepared in the absence and presence of thioglycolic acid (TGA) molecules by using a chemical precipitation method. The as‐prepared ZnS QDs are characterized by photoluminescence (PL), UV–vis absorption, Fourier transform infrared (FTIR), and X‐ray powder diffraction (XRD). Based on the calculation from XRD patterns, the temporal evolution of ZnS‐TGA QD size is fashioned and is in agreement with the Ostwald ripening process. The temporal evolution of ZnS–TGA QD size is divided into two regimes and two approximate expressions of growth time (t) − average size (d) as t = Ad3 + B and t = Cd2 + D (A, B, C, D are constants) for lower and higher values of t are suggested, respectively. The growth rates are large in the lower regime and are near zero in the higher regime. The time value at the frontier of these regimes is revealed as the necessary time to synthesize ZnS–TGA QDs. Under the experimental conditions, this value is 60 min (corresponding size of 1.80 nm). This study paves the way for determining the fabrication time of ligand‐capped quantum dots.

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Synthesis of ZnS Quantum Dots for QDs-LED hybrid device with different cathode materials

Cited by 8 publications

References 10 publications

Influence on structural, electronic and optical properties of Fe doped ZnS quantum dot: A density functional theory based study

Influence on structural, electronic and optical properties of Fe doped ZnS quantum dot: A density functional theory based study

Exploring the Effects of Various Capping Agents on Zinc Sulfide Quantum Dot Characteristics and In‐vitro Fate

Time‐Dependent Growth Rates of TGA‐Capped ZnS Nanocrystals as a Synthetic Formula for Ligand‐Capped Quantum Dots

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