Synthesis and Characterization of Bifunctional Fluorescent Magnetic Fe3O4/Alendronate@CdSe/CdS Nanocomposites†

doi:10.7503/cjcu20140988

Abstract

Abstract:

Magnetic Fe₃O₄ nanoparticles were synthesized via chemical co-precipitation method and then modified by tetramethylammonium hydroxide(TMAOH), alendronate, butyl acrylate and anhydrous ethylenediamine to prepare dendrimer-like grafted Fe₃O₄ nanoparticles. CdSe/CdS quantum dots(QDs) were synthesized via oil phase method, and then transferred into aqueous phase by thioglycolic acid modification to improve their water-solubility and stability. With connecting the modified Fe₃O₄ nanoparticles and quantum dots, we synthesized the bifunctional fluorescent magnetic Fe₃O₄/Alendronate@CdSe/CdS nanocomposites. The results show that the fluorescence performance of the material can be significantly enhanced via this method. However, it doesn’t change lineary with the algebra.

Key words: Quantum dot, Magnetic nanoparticle, Bifunctional nanocomposite

CLC Number:

O611.6

TrendMD:

LIU Min, WANG Xiuling, LIU Yongjian, CHEN Yongbing, FU Yafeng, ZHOU Xiang. Synthesis and Characterization of Bifunctional Fluorescent Magnetic Fe₃O₄/Alendronate@CdSe/CdS Nanocomposites^†[J]. Chem. J. Chinese Universities, 2015, 36(5): 850.

Figures/Tables 8

Scheme 1 Ideal synthetic route to dendrimer-like grafted Fe3O4 nanoparticles

Fig.1 Structure of fluorescent magnetic nanocomposite G1F

Fig.2 XRD patterns of bare Fe3O4 nanoparticles(a) and G0(b), G1(c), G2(d) nanoparticles

Fig.3 Fluorescence spectra of CdSe/CdS QDs(a), G0F(b), G1F(c) and G2F(d)

Fig.4 Fluorescence microscopy images of G0F(A), G1F(B) and G2F(C)

Fig.5 Photos of G0F without(A) and with(B) magnetic field

Fig.6 Magnetization curves of bare Fe3O4 nanoparticles(a) and G0F(b), G1F(c), G2F(d) at room temperature

Fig.7 TEM images of G0F(A), G1F(B) and G2F(C)

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Synthesis and Characterization of Bifunctional Fluorescent Magnetic Fe₃O₄/Alendronate@CdSe/CdS Nanocomposites^†

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