共 24 条
Water-soluble NaYF4:Yb,Er(Tm)/NaYF4/polymer core/shell/shell nanoparticles with significant enhancement of upconversion fluorescence
被引:694
作者:

Yi, Guang-Shun
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机构: Department of Materials Science and Engineering, National University of Singapore

Chow, Gan-Moog
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机构: Department of Materials Science and Engineering, National University of Singapore
机构:
[1] Department of Materials Science and Engineering, National University of Singapore
关键词:
D O I:
10.1021/cm062447y
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Hexagonal bulk nanoparticles of NaYF4:Yb,Er(Tm) were prepared by solid-state or hydrothermal reaction. These hexagonal phase NaYF 4:Yb,Er(Tm) nanoparticles of small size and narrow size distribution were hydrophobic with lower fluorescence compared to the bulk counterparts. These hydrophobic C/S nanoparticles rendered hydrophobic by a layer of amphiphilic polymer. The polymer coated C/S nanoparticles synthesized contain an amphiphilic layer, 25% octylamine, and 40% isopropylamine modified poly(acrylic acid) (PAA). The organic surfactant with high vibrational energy on the nanoparticle surface quench fluorescence. The transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) images of NaYF4:Yb,Er(Tm) confirm single crystallinity. The results show major upconversion fluorescence enhancements of 7.4 times from NaYF4:Yb, Er C/S and 29.6 times from NaYF4:Yb, Tm C/S.
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页码:341 / 343
页数:3
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