Surface Coating of Hydrophobic Up-converting Nanoparticles in Homogenous Liquid Phase System and Application in Optical Detection†

doi:10.7503/cjcu20150944

Abstract

Abstract:

NaYF₄∶Yb³⁺,Er³⁺ nanoparticles were successfully surface-coated via a hydrophobic nanoparticles adsorption surfactant intermediate(NaYF₄-SDS)process with hydrolysed poly(maleic anhydride-alt-1-octadecene) molecules(PMAO). This method overcomes the defect that oil-soluble nanocrystals and weak polar polymer molecules could hardly well-disperse in a single system and the surface-coating was realized in homo-genous solution system. The surface-coating process was confirmed by Fourier transform infrared spectra(FTIR) and surface Zeta potential. Investigations by transmission electron microscopy(TEM) and photoluminescence(PL) spectroscopy showed no obvious variations in the morphologies and luminescent properties of the nanoparticles during the surface-coating process. The specific molecular recognition capacity of PMAO-coated nanoparticles confirms that hydrophilic NaYF₄-PMAO are suitable for potential biological labeling.

Key words: Nanoparticles, Up-conversion luminescence, Polymers surface coating, Biological application

CLC Number:

O614

TrendMD:

ZHANG Qingbin, KONG Xianggui, CHENG Cheng. Surface Coating of Hydrophobic Up-converting Nanoparticles in Homogenous Liquid Phase System and Application in Optical Detection^†[J]. Chem. J. Chinese Universities, 2016, 37(3): 429.

Figures/Tables 7

Scheme 1 Illustration of the surface coating approach of NaYF4∶Yb3+, Er3+ with PMAO

Fig.1 TEM images of NaYF4∶Yb3+, Er3+ nanocrystals before(A) and after(B) surface coating process

Fig.2 Hydrodynamic diameter distribution of the polymer coated NaYF4∶Yb3+, Er3+ in water

Fig.3 FTIR spectra of NaYF4-SDS(A) and NaYF4-PMAO(B)

Fig.4 Zeta potential at the surface of NaYF4-PMAO nanoparticles

Fig.5 Luminescence spectra of NaYF4∶Yb3+, Er3+ nanoparticles in cyclohexane(a) and NaYF4-PMAO nanoparticles in water(b)λex=980 nm.

Fig.6 Fluorescence image of avidin-coated NaYF4-PMAO and biotinylated IgG bioconjugates(A) and the result of control experiment(B)

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