Synthesis, Structure, Morphology, Element composition, Electrochemical, and Optical studies of Zn0.98-XMn0.02CeX Quantum dots

Sakthivel, P.; Mangalaraja, Ramalinga Viswanathan; Ramalingam, G.; Sakthipandi, K.; Gowtham, V.

doi:10.1016/j.saa.2023.123140

Cited by 8 publications

(2 citation statements)

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“…Comparatively, the excitonic absorption peak positions in the absorption spectra of the prepared nanostructures exhibit a slight blue shift when compared to the bulk ZnS value (334 nm) [58] . This modest blue shift in the UV‐Vis absorption spectra‘s excitonic absorption peak is attributed to the ‘quantum confinement effect’ due to the ultra‐thin dimensions of the ZnS quantum dots [59–60] . The UV spectra does indicates that the ZnS molecules are in aggregated state.…”

Section: Resultsmentioning

confidence: 92%

“…[58] This modest blue shift in the UV-Vis absorption spectra's excitonic absorption peak is attributed to the 'quantum confinement effect' due to the ultra-thin dimensions of the ZnS quantum dots. [59][60] The UV spectra does indicates that the ZnS molecules are in aggregated state. The appearance of distinct peaks or shifts in the UV spectrum upon aggregation suggests changes in the molecular environment and interactions, revealing the propensity of ZnS to exhibit AIE behaviour.…”

Section: Uv-visible Spectral Analysismentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 92%