Mn-doped ZnS phosphorescent quantum dots: Coumarins optical sensors

Pacheco, María Emilia; Castells, Cecilia Beatriz Marta; Bruzzone, Liliana

doi:10.1016/j.snb.2016.07.125

Cited by 47 publications

(15 citation statements)

References 59 publications

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“…reported that the XRD pattern of the synthesized Mn‐doped ZnS QDs display the (111), (220), and (311) planes for the cubic (zinc blende) phase . In addition, by means of the Scherrer's formula, the average crystallite size is calculated to be 2.4 nm, which is consistent with the above‐mentioned TEM analysis . In Figure b, the TG curve of the Mn‐doped ZnS QDs/alginate sample shows the major weight loss in the temperature range from 190 to 600 °C.…”

Section: Resultssupporting

confidence: 90%

“…In Figure a, the UV–vis spectrum of Mn‐doped ZnS QDs displays a new broad peak near 280 nm compared to that of the control alginate, which is assigned to the absorption peak of Mn‐doped ZnS QDs. Similarly, Pacheco and co‐workers reported that Mn‐doped ZnS QDs exhibited an absorption peak at 276 nm . Moreover, the images in Figure b reveal that the solution containing Mn‐doped ZnS QDs shows an orange‐red fluorescence under 302 nm of UV light, whereas the control alginate shows no fluorescence.…”

Section: Resultssupporting

confidence: 90%

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Direct Generation of Mn‐Doped ZnS Quantum Dots/Alginate Nanocomposite Beads Based on Gelation and In Situ Synthesis of Quantum Dots

Chen

Lei

Wang

et al. 2019

Macro Materials & Eng

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/mame.201800681. ZnS Quantum DotsHerein, a concise and novel method is developed to directly generate Mndoped ZnS QDs/alginate nanocomposite beads. In this method, the ionic gelation of alginate is employed to produce alginate gel beads in a solution of Zn 2+ and Mn 2+ ions. Subsequently, the gel beads serve as the reaction support for in situ synthesis of Mn-doped ZnS QDs in the beads through the reaction of sodium sulfide with Zn 2+ and Mn 2+ ions. The method has many benefits such as the simple preparation, the environmentally friendly process, the mild conditions, and the easy post-treatment for the beads. The resulting QDs/alginate beads are homogeneous and stable gel spheres which show clear fluorescence. TEM images demonstrate that Mn-doped ZnS QDs are homogeneously distributed within the QDs/alginate nanocomposite, and their average size is 2.4 ± 0.3 nm. Potentially, the QDs/alginate beads can be utilized for fluorescence bioimaging, as well as fluorescence detection toward metal ions.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 90%

Direct Generation of Mn‐Doped ZnS Quantum Dots/Alginate Nanocomposite Beads Based on Gelation and In Situ Synthesis of Quantum Dots

Chen

Lei

Wang

et al. 2019

Macro Materials & Eng

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“…Because of its high dielectric constant, excellent insulation properties and exceptional chemical stabilities, ZnS is considered as one of the most important passivation materials for semiconductor devices, especially for high-aspect ratio arrays based on HgCdTe [6,7]. Recently, ZnS quantum dots (QDs) have attracted considerable attention because of their broad biomedical (fluorescent probes) and sensor applications [8,9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Structural and Optical Characterization of ZnS Ultrathin Films Prepared by Low-Temperature ALD from Diethylzinc and 1.5-Pentanedithiol after Various Annealing Treatments

et al. 2019

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The structural and optical evolution of the ZnS thin films prepared by atomic layer deposition (ALD) from the diethylzinc (DEZ) and 1,5-pentanedithiol (PDT) as zinc and sulfur precursors was studied. A deposited ZnS layer (of about 60 nm) is amorphous, with a significant S excess. After annealing, the stoichiometry improved for annealing temperatures ≥400 °C and annealing time ≥2 h, and 1:1 stoichiometry was obtained when annealed at 500 °C for 4 h. ZnS crystallized into small crystallites (1–7 nm) with cubic sphalerite structure, which remained stable under the applied annealing conditions. The size of the crystallites (D) tended to decrease with annealing temperature, in agreement with the EDS data (decreased content of both S and Zn with annealing temperature); the D for samples annealed at 600 °C (for the time ≤2 h) was always the smallest. Both reflectivity and ellipsometric spectra showed characteristics typical for quantum confinement (distinct dips/peaks in UV spectral region). It can thus be concluded that the amorphous ZnS layer obtained at a relatively low temperature (150 °C) from organic S precursor transformed into the layers built of small ZnS nanocrystals of cubic structure after annealing at a temperature range of 300–600 °C under Ar atmosphere.

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“…As PQDs [16][17][18] not only have advantages such as long uorescence lifetime, high selectivity, broad linearity range, high sensitivity and good repeatability but also can avoid disturbance from background uorescence and scattered light of the biological uid, 19,20 especially Mn-ZnS QDs, which have superior optical properties, have been widely applied in the biomolecular detection process. 21,22 If DNA-PQDs are prepared using DNA as the template, this will greatly widen the application range of existing Mn-ZnS PQDs in biology.…”

Section: Introductionmentioning

confidence: 99%

Preparation of DNA functional phosphorescent quantum dots and application in melamine detection in milk

et al. 2019

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Mn-doped ZnS phosphorescent quantum dots: Coumarins optical sensors

Cited by 47 publications

References 59 publications

Direct Generation of Mn‐Doped ZnS Quantum Dots/Alginate Nanocomposite Beads Based on Gelation and In Situ Synthesis of Quantum Dots

Direct Generation of Mn‐Doped ZnS Quantum Dots/Alginate Nanocomposite Beads Based on Gelation and In Situ Synthesis of Quantum Dots

Structural and Optical Characterization of ZnS Ultrathin Films Prepared by Low-Temperature ALD from Diethylzinc and 1.5-Pentanedithiol after Various Annealing Treatments

Preparation of DNA functional phosphorescent quantum dots and application in melamine detection in milk

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