期刊
CRYSTENGCOMM
卷 17, 期 31, 页码 5900-5905出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ce01061f
关键词
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资金
- National Science Foundation of China [21471043, 21101140]
- Key Project of Anhui Provincial Educational Department [JZ2014AJZR0113]
Upconversion fluorescent nanostructures with controlled sizes and morphologies have attracted much attention due to their potential and important applications in bioimaging, photodynamic therapy, solar cells and so on. In this work, we describe a facile successive process to fabricate beta-NaGdF4:Yb,Er nanocrystals coated with an ultrathin layer of CaF2 with enhanced upconversion fluorescence and stability. The as-prepared beta-NaGdF4:Yb,Er@CaF2 nanoparticles were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM, JEM 21000), fluorescence spectroscopy (Hitachi High-Technology Corporation, F-2700) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The as-prepared core-shell nanoparticles show enhanced upconversion fluorescence and superior magnetic resonance (MR) relaxivity. In addition, the as-prepared beta-NaGdF4:Yb,Er@CaF2 nanoparticles show enhanced chemical stability after surface functionalization and transfer into aqueous solutions.
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