ZnS quantum dots as fluorescence sensor for quantitative detection of tetracycline

Mili, Khawla; Hsine, Zouhour; Chevalier, Yves; Hbaïeb, Souhaïra; Mlika, R.

doi:10.1016/j.optmat.2022.112103

Cited by 22 publications

(9 citation statements)

References 55 publications

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“…From bandgap data, the average particle size of all the synthesized ZnCdS QDs is determined by applying Brus equation 51 eqn (2).where, and E g are the bandgap energies of QDs and bulk material, respectively. r is the radius of QDs, h is Plank's constant, m e is the effective mass of the electron (0.2 m o ), m h is the effective mass of hole (0.8 m o ), m o is the rest mass of the free electron (9.11 × 10 −31 kg), ε r is relative dielectric constant (5.7 ε o ), ε o is the dielectric constant of the vacuum (8.85 × 10 −12 C 2 N −1 m −2 ) and e is the standard charge on an electron (1.6022 × 10 −19 C).…”

Section: Resultsmentioning

confidence: 99%

Enhancing the FRET by tuning the bandgap of acceptor ternary ZnCdS quantum dots

Mubeen,

Ain,

Khalid

et al. 2023

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Enhancing the FRET by tuning the bandgap of acceptor ternary ZnCdS quantum dots

Mubeen,

Ain,

Khalid

et al. 2023

RSC Adv.

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“…This spectrum contained broad absorption bands in the UV region that extended to the visible region. The rst electronic transition 1Se-1S h was associated to the absorption edges at 307 nm (Khawla et al 2022). This spectrum showed a blue shift due to the size effect of the ZnS-TGA NPs, which differed from the response obtained for the bulk ZnS (344 nm).…”

Section: Optical Characterization Of Tga-capped Zns Npsmentioning

confidence: 99%

An effective and sustainable dye removal via sunlight-based photocatalysis and adsorption using eco-friendly and low-cost ZnS nanoparticles: Experiments, modelling, and mechanism

Ouni,

Yahia,

Mohamed

et al. 2024

Preprint

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Novel sulfur zinc nanoparticles functionalized with thioglycolic acid were synthetized via hydrothermal route and tested in a solar radiation-based dye photodegradation process. These nanoparticles were characterized, and the findings revealed that thioglycolic acid was a strong capping ligand for the generation of sulfur zinc nanoparticles with a specific surface area of 36.82 m2/g and 7.15 nm average nanocrystal size. The cubic and wurtzite phases of these nanoparticles were confirmed via X-ray diffraction. The quantum confinement effect caused a larger energy band gap and a blue shift in the absorbance band of these nanoparticles in contrast to the bulk sulfur zinc. The improved adsorption effectiveness of these nanoparticles was proved to remove methylene blue from aqueous solutions. They can remove 30.92 mg/g of tested dye molecule. To understand the synergy between adsorption and photocatalysis, these nanoparticles were used to analyze the dye adsorption prior to the photodegradation via the experimental measurement of isotherms and kinetics. The rationalization of the dye adsorption on these nanoparticles was performed with calculated statistical physics parameters including the estimation of dye – nanoparticles adsorption energy. Dye molecules and nanoparticles surface exhibited physical interactions with adsorption energies of 25.92–23.31 kJ/mol. The sunlight-based photocatalytic activity of these nanoparticles demonstrated 91.1% dye degradation efficiency in 180 min. Overall, the photocatalytic efficiency remained almost unchanged after five consecutive degradation cycles with a methylene blue degradation of 88 ± 3%. These results indicate that these sustainable nanoparticles can be applied in the cleaning of industrial and urban fluids polluted by hazardous organic compounds like dye molecules.

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“…[11] By introducing different activating metal ions, it becomes possible to extensively tailor the luminescent properties of ZnS. [12][13][14][15] Although colloidal chemistry has played a crucial role in generating a wide range of uniform nanocrystal systems comprising both semiconductors [16] and metals, [17] the primary focus has often revolved around fine-tuning general experimental factors such as precursors, [18] ligands, [19] and reaction temperatures. [20] These adjustments, however, frequently give rise to challenges and demand additional size-selection procedures.…”

Section: Introductionmentioning

confidence: 99%

“…This is achieved by using potent surface‐passivating agents like thiols or surfactants, which form covalent bonds with the surface atoms of the nanocrystallites [11] . By introducing different activating metal ions, it becomes possible to extensively tailor the luminescent properties of ZnS [12–15] …”

Section: Introductionmentioning

confidence: 99%

Fluorescence Resonance Energy Transfer Study Between ZnS Quantum Dots and Fluoranthene

Rajkumari,

Roy,

Goswami

2024

ChemistrySelect

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Single‐phase zinc sulphide (ZnS) quantum dots were synthesized by hydrothermal method without using any capping agent. X‐ray power diffraction, transmission electron microscopy, and ultraviolet‐visible spectroscopy were used to characterize the structure, size, surface states. Photoluminescence properties of ZnS quantum dots were studied to apply it as fluorescence sensor. The results showed that the crystal structure of ZnS quantum dots was a cubic zinc blende, and their average diameter was about 3.5 nm. A strong broad band cantered at about 320 nm was observed in the excitation spectrum of ZnS quantum dots. Their emission spectrum peaking at about 408 nm, was due mostly to the trap‐state emission. We used cadmium as fluorescence super quencher to detect the presence of cadmium. The relative integrated emission intensity of ZnS quantum dots decreased as the amount of Cd increased. That 408 nm emitted radiation was then used to detect the presence of fluoranthene, a potential carcinogen, present in solution. The novelty of the process is the use of water as a solvent for synthesis, without using any capping agent by slow hydrothermal process.

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ZnS quantum dots as fluorescence sensor for quantitative detection of tetracycline

Cited by 22 publications

References 55 publications

Enhancing the FRET by tuning the bandgap of acceptor ternary ZnCdS quantum dots

Enhancing the FRET by tuning the bandgap of acceptor ternary ZnCdS quantum dots

An effective and sustainable dye removal via sunlight-based photocatalysis and adsorption using eco-friendly and low-cost ZnS nanoparticles: Experiments, modelling, and mechanism

Fluorescence Resonance Energy Transfer Study Between ZnS Quantum Dots and Fluoranthene

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