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

Abstract

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.

ZnS Quantum Dots/Gelatin Nanocomposites with a Thermo-Responsive Sol–Gel Transition Property Produced by a Facile and Green One-Pot Method

“…Figure 3b shows that photoluminescence spectrum of the ZnS QDs/gelatin has an emission peak centered at 420 nm under UV light excitation compared with that of the control gelatin, which is attributed to the typical photoluminescence feature of ZnS QDs. 8 Moreover, the QY value of ZnS QDs was detected corresponding to rhodamine 6G in water by the previously reported method, 48,49 and the result shows that the QY value of ZnS QDs is 14.9%.…”

“…The resulting ZnS QDs/gelatin nanocomposites were examined under 302 nm UV light. Moreover, the quantum yield (QY) of ZnS QDs was detected relative to rhodamine 6G in water (QY = 95%) according to the previously described method. , …”

“…Moreover, the quantum yield (QY) of ZnS QDs was detected relative to rhodamine 6G in water (QY = 95%) according to the previously described method. 48,49 The Mn-doped ZnS QDs/gelatin nanocomposite was also prepared through the one-pot method. Specifically, a manganese acetate solution (0.1 M) was produced by adding manganese acetate tetrahydrate (2.45 g) to distilled water (100 mL) with stirring.…”

Metal–Organic Frameworks Derived from Zn and p‐Hydroxybenzoic Acid for Smoke Suppression and Flame Retardation in Vinyl Resin

“…[20,21] MOFs have been applied in various fields such as optics, electronics, and medicine. [22][23][24][25][26][27][28] In recent years, there is growing research on using MOFs as flame-retardants in polymers. MOFs with suitable designs were reported to significantly improve the flame retardation and smoke suppression properties of polymers when added to the polymers alone.…”

Electrodeposited Alginate‐Based Green Synthesis of CuS Nanoparticles and Nanocomposite Films for Electrochemical and Colorimetric Detection

“…In addition, some researchers noticed that alginate can be used on the green synthesis of nanoparticles. [32,33] For example, Xiong et al synthesized palladium nanoparticles in a green way using alginate as both reductant and stabilizer. [32] However, no systematic research has been devoted to the green synthesis of CuS NPs by utilizing alginate.…”