Aqueous synthesis and characterization of CdS, CdS:Zn2+ and CdS:Cu2+ quantum dots

Unni, C.; Philip, Daizy; Smitha, S.L.; Nissamudeen, K.M.; Gopchandran, K.G.

doi:10.1016/j.saa.2008.11.027

Cited by 67 publications

(30 citation statements)

References 37 publications

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“…. 48,49 Among the employed surface ligands, GSH shifted the diffraction peaks toward the CdS cubic crystalline phase the most. This happened because GSH was more susceptible to thermal decomposition and probably passivated the QDs surface more effectively.…”

Section: Cdse Qdsmentioning

confidence: 99%

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

et al. 2016

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In this work a colloidal approach to synthesize water-soluble CdSe quantum dots (QDs) bearing a surface ligand, such as thioglycolic acid (TGA), 3-mercaptopropionic acid (MPA), glutathione (GSH), or thioglycerol (TGH) was applied. The synthesized material was characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), UV-visible spectroscopy (UV-Vis), and fluorescence spectroscopy (PL). Additionally, a comparative study of the optical properties of different CdSe QDs was performed, demonstrating how the surface ligand affected crystal growth. The particles sizes were calculated from a polynomial function that correlates the particle size with the maximum fluorescence position. Curve resolution methods (EFA and MCR-ALS) were employed to decompose a series of fluorescence spectra to investigate the CdSe QDs size distribution and determine the number of fraction with different particle size. The results for the MPA-capped CdSe sample showed only two main fraction with different particle sizes with maximum emission at 642 and 686 nm. The calculated diameters from these maximum emission were, respectively, 2.74 and 3.05 nm.

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Section: Cdse Qdsmentioning

confidence: 99%

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

et al. 2016

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“…Wageh and Badr (2008) have reported that the Cd 1-x Zn x S nanoparticle is stabilized by the bifunctional organic molecule. Unni (2009) has reported on the size-tunable aqueous synthesis and PL properties of the Zn 2? -and Cu 2?…”

Section: Introductionmentioning

confidence: 99%

Synthesis and structural, optical and thermal properties of CdS:Zn2+ nanoparticles

2013

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Undoped and Zn (1-5, 10 %) -doped CdS nanoparticles were successfully synthesized by chemical method and polyvinylpyrrolidone was used as capping agent. The morphology and crystalline structure of the samples were studied by transmission electron microscopy and X-ray diffraction. The average particle size of the spherical nanoparticles determined by these techniques was of the order of 2.5-6 nm. The functional groups of the capping agent on CdS:Zn 2? surface were identified by FT-IR study. The band gap of the nanoparticles was calculated using UV-visible absorption spectra and the result showed that the band gap values were dramatically blue shifted from the bulk CdS. The optimum concentration of the doping ions was selected through absorption study. Photoluminescence of the CdS:Zn 2? nanoparticle showed strong blue and green emission. The thermal properties of the nanoparticles were analyzed by thermogravimetricdifferential thermal analysis.

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“…All measured diffractions can be assigned to the standard pattern of the face centered cubic phase with space group F43m, which suggests previously proposed mechanism of low temperature crystal growth. [42][43][44] Calculated cell parameter a of studied QDs is 5.878(4)Å. The low width of observed diffraction peaks suggests nanosize QDs.…”

Section: Resultsmentioning

confidence: 91%

Exposure enhanced photoluminescence of CdS_0.9Se_0.1quantum dots embedded in spin-coated Ge₂₅S₇₅thin films

2017

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Aqueous synthesis and characterization of CdS, CdS:Zn2+ and CdS:Cu2+ quantum dots

Cited by 67 publications

References 37 publications

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

Synthesis and structural, optical and thermal properties of CdS:Zn2+ nanoparticles

Exposure enhanced photoluminescence of CdS_0.9Se_0.1quantum dots embedded in spin-coated Ge₂₅S₇₅thin films

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Aqueous synthesis and characterization of CdS, CdS:Zn2+ and CdS:Cu2+ quantum dots

Cited by 67 publications

References 37 publications

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots

Synthesis and structural, optical and thermal properties of CdS:Zn2+ nanoparticles

Exposure enhanced photoluminescence of CdS0.9Se0.1quantum dots embedded in spin-coated Ge25S75thin films

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Exposure enhanced photoluminescence of CdS_0.9Se_0.1quantum dots embedded in spin-coated Ge₂₅S₇₅thin films