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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
Author(s) -
Chen Wei,
Lei Jian,
Wang Yifeng,
Mendes Paula M.,
Zhang Zheng,
Hu Qian,
Xiong Yanfei,
Pan Jie
Publication year - 2019
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201800681
Subject(s) - nanocomposite , materials science , quantum dot , fluorescence , ionic bonding , chemical engineering , nanoparticle , metal ions in aqueous solution , sodium alginate , doping , nanotechnology , zinc sulfide , ion , sulfide , in situ , metal , sodium , organic chemistry , chemistry , metallurgy , physics , optoelectronics , quantum mechanics , engineering , zinc
Herein, a concise and novel method is developed to directly generate Mn‐doped 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.