Biphasic quantum dots of cubic and hexagonal Mn doped CdS; necessity of Rietveld analysis

Heiba, Zein K.; Mohamed, Mohamed Bakr; Imam, N.G.

doi:10.1016/j.jallcom.2014.08.106

Cited by 68 publications

(24 citation statements)

References 22 publications

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“…Fig 2 presents Rietveld analysis fitting assuming single wurtzeit phase (a) and two phases (b) for CdS prepared at 200 °C. In our previous study [9], we demonstrated the necessity of Rietveld analysis for nano or quantum dots chalcogenides, due to the presence of main diffraction peaks (111), (220) and (331) of the cubic phase exactly beneath the peaks (002), (110) and (112) of the hexagonal phase. For samples annealed at T≥300 °C, a third phase, cubic CdO with the space group F m-3m, was identified beside the other two phases for CdS.…”

Section: Resultsmentioning

confidence: 96%

“…Cd/Zn chalcogenides crystalize either in hexagonal wurtzite or cubic zinc blend structure. Biphasic CdS was reported with different synthesis methods [7][8][9]. When dealing with nano or quantum dots chalcogenides, the diffraction peaks are broad and heavy overlapping of peaks may occur.…”

Section: Introductionmentioning

confidence: 99%

“…In such case, the main diffraction peaks (111), (220) and (331) of the cubic phase lay exactly beneath the peaks (002), (110) and (112) of the hexagonal phase, accordingly the cubic phase may be present and not visible in the diffraction pattern. From the above, phase analysis other than simple diffraction pattern indexing should be conducted [8,9]. Quantum dots (QDs) have been attracting researchers'attention because of their potentials for use as nanotechnology key components [10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural tuning of CdS nanoparticles with nucleation temperature and its reflection on the optical properties

Mohamed

Imam

2015

Journal of Molecular Structure

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural tuning of CdS nanoparticles with nucleation temperature and its reflection on the optical properties

Mohamed

Imam

2015

Journal of Molecular Structure

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“…Growth and fabrication of CdS nanoparticles was performed with some researchers [6] [12] [14] previously. The focus of each work was on the improvement of one parameter in the fabricated nanoparticles, while other criteria were not investigated carefully [1] [3] [15] [16]. One of the major contributions of this paper is fabrication and characterization of high luminescent Bare and Mn-doped CdS nanoparticles while a sort of parameters and conditions are taken into account.…”

Section: Background Of the Previous Workmentioning

confidence: 99%

A Novel Thermochemical Method for Fabrication and Theoretical Explanation of High Luminescent Mn-Doped CdS Nanoparticles

Darvishi¹,

Nikfarjam²

2018

MSCE

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In this paper, fabrication and characterization of bare and doped CdS nanoparticles as well as investigating the luminescence properties of these particles as an important II-VI semiconductor are presented. A novel Thermochemical method was used for synthesis of these quantum dots. Thiols were used as the capping agent to prevent further growth during fabrication process. The application of TGA as a capping agent instead of TG was studied as a novel idea in this paper and was used practically in the synthesis of semiconductor nanoparticles. Using this process resulted in particles with sizes between 3 -7 nm. Several samples were synthesized and characterized under various Mn ions doping ratio from 1:10 to 1:180, different temperatures from 40˚C to 96˚C and different pH values from 6 to 10. Synthesis of CdS nanoparticles with high Mn ions concentration resulted in luminescence decrement, while luminescence of nanoparticles was increased by decreasing Mn/Cd doping ratio until Mn:Cd = 1:180. The best fabrication temperature was obtained at 96˚C and the highest luminescence was observed at the pH value of 9. A theoretical explanation for the behavior of fabricated high luminescent quantum dots is presented based on the principles of quantum mechanics. Among semiconductor nano-materials, CdS nanoparticles have attracted considerable attention due to their unique properties, which do not present in their bulk materials [2]. These unique properties introduce them as the important and useful materials for various applications such as solar cells, photodetectors, light-emitting diodes, photoelectrolysis and biological labels [3] [4] [5] [6].Nanoparticles have been grown in a variety of ways, namely precipitation in the solid phase [7] [8], using porous materials as templates [9], growth in nano-sized micelles and precipitation in the liquid phase [10] [11].

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“…Initially, work was done on II-VI semiconductors such as A 1-x II Mn x B VI [10]; among those, CdSan important semiconductor having Bohr radius, 2.4 nm, and direct band gap, 2.42 eV, exhibits interesting nonlinear optical and luminescence properties [11,12]. CdS at nanoscale would be a multifunctional material with coexisting and possibly coupled semiconducting, optical, and magnetic properties [13].…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic behavior of Cd1−xNixS nanorods: a novel study

Kaur

Verma

2015

J Mater Sci: Mater Electron

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Cd 1-x Ni x S (x = 0.00, 0.03, 0.05, 0.10) nanorods were synthesized by solvothermal method. Structural, compositional, morphological, optical, and magnetic studies of the undoped and doped CdS nanorods were carried out using, respectively, XRD, EDAX, TEM, HRTEM, SAED, UV-visible, PL, VSM. XRD confirm the formation of hexagonal wurtzite structure of undoped and Ni-doped CdS nanorods with varying crystallite size from 23.79 to 13.93 nm. The EDAX spectra show no extra impurity elements. UV-visible analysis, using Tauc's relation, reveal blue shift. PL spectra show that green emission is prominent in case of undoped and Ni-doped nanorods. Rod-like morphology has been confirmed by TEM. VSM confirms the ferromagnetic nature of the nanorods as well as the influence of Ni-doping.

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Biphasic quantum dots of cubic and hexagonal Mn doped CdS; necessity of Rietveld analysis

Cited by 68 publications

References 22 publications

Structural tuning of CdS nanoparticles with nucleation temperature and its reflection on the optical properties

Structural tuning of CdS nanoparticles with nucleation temperature and its reflection on the optical properties

A Novel Thermochemical Method for Fabrication and Theoretical Explanation of High Luminescent Mn-Doped CdS Nanoparticles

Ferromagnetic behavior of Cd1−xNixS nanorods: a novel study

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