NaYF4∶Yb3+,Er3+ Upconverting Nanoparticles Surface Ligand Exchange in Ternary Mixture Solvent and Optical Properties†

doi:10.7503/cjcu20130779

Abstract

Abstract:

Hydrophobic up-converting rare-earth nanoparticles(UCNPs) were transferred from organic solvent to aqueous solution via a simple surface-ligand exchange procedure. 2-Aminoethyl dihydrogen phosphate(AEP) molecules were used to replace the original hydrophobic ligands in chloroform, ethanol and water ternary mixture solvent at ambient temperature. The ligand exchange process was confirmed by Fourier transform infrared spectra(FTIR) and thermogravimetric analysis(TG). Investigations by transmission electron microscopy(TEM), dynamic light scattering(DLS) and photoluminescence(PL) spectroscopy show no obvious variations in the morphologies, structure and luminescentproperties of the UCNPs during the ligand exchange process. The fluorescence confocal cell imaging of AEP modified hydrophilic UCNPs confirms that the hydrophilic UCNPs are suitable for potential biological labeling.

Key words: Upconversion nanoparticle, 2-aminoethyl dihydrogen phosphate(AEP), Ligand exchange

CLC Number:

O616

TrendMD:

ZHANG Qingbin, KONG Xianggui, WANG Xin, CHENG Cheng. NaYF₄∶Yb³⁺,Er³⁺ Upconverting Nanoparticles Surface Ligand Exchange in Ternary Mixture Solvent and Optical Properties^†[J]. Chem. J. Chinese Universities, 2014, 35(2): 224.

Figures/Tables 8

Fig.1 Schematic illustration of the general principle of the ligand exchange approach using 2-aminoethyl dihydrogenphosphate substitutional ligands

Fig.2 TEM images of NaYF4∶Yb3+,Er3+ UCNPs before(A) and after(B) ligand exchange

Fig.3 Hydrodynamic diameter distribution of the AEP coated NaYF4∶Yb3+, Er3+ UCNPs in water

Fig.4 FTIR spectra of NaYF4∶Yb3+,Er3+ UCNPs before(a) and after(b) ligand exchange using AEP

Fig.5 TGA curves of NaYF4∶Yb3+, Er3+ UCNPs before(a) and after(b) ligand exchange

Fig.6 Luminescence spectra of NaYF4∶Yb3+,Er3+ UCNPs in chloroform(a) and AEP capped sample in water(b)

Fig.7 Fluorescence image of NaYF4∶Yb3+,Er3+ NCs dissolved in water without excitation(A) and continuous-wave excitation at 980 nm(B)

Fig.8 Confocal fluorescence images of the HeLa cell (A) Bright-field images; (B) the dark-field images.

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NaYF₄∶Yb³⁺,Er³⁺ Upconverting Nanoparticles Surface Ligand Exchange in Ternary Mixture Solvent and Optical Properties^†

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