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A Novel Strategy to Synthesize Dual Blue Fluorescent‐Magnetic EuCl 2 Nanocrystals via One‐Pot Method with Controlled Morphologies Using Urea
Author(s) -
Zhao Tianxin,
Xin Jingwei,
Jiang Yingnan,
Zhao Yue,
Zhao Yueqi,
Zhao Yu,
Sun Weiyi,
Yang Bai,
Lin Quan
Publication year - 2018
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201800106
Subject(s) - nucleation , europium , chemistry , urea , nanoparticle , magnetization , x ray photoelectron spectroscopy , nanocrystal , materials science , chemical engineering , nuclear chemistry , nanotechnology , organic chemistry , magnetic field , ion , physics , quantum mechanics , engineering
Divalent state europium nanocrystals (Eu II NCs) have tremendous number of applications such as biological detection, solar cells, medical imaging, and so on. Here, a ready synthetic one‐pot approach to prepare dual blue fluorescent‐magnetic EuCl 2 NCs is reported. EuCl 3 is reduced by the reducing agent urea, while the oleic acid and oleyl amine are used as the capping ligand. A serial of analysis, such as X‐ray photoelectron spectroscopy, electron spin resonance, and zero‐field cooling magnetization curve/field cooling magnetization curve are performed to confirm the successful reduction of EuCl 2 . It is novel that the morphology and size of produced EuCl 2 NCs could be adjusted efficiently by the reducing agent urea, including rod shaped, wire shaped, and fiber shaped. The mechanism of controlling the size and morphology of synthetic EuCl 2 NCs by the urea content is discussed in detail. What is more, it has been demonstrated that in this one‐pot method the homogeneous and complete nucleation needs to perform slowly in high temperature reaction stage, and then the uniformed crystals are gradually formed during the slow cooling process. That is an appealing strategy for tunable design and synthesis of multifunctional Eu II NCs.