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Fe3O4@GdF3:Er3+,Yb3+ nanoparticles: synthesis and bifunctional properties

GUIXIA LIU1,* , HONGXIA PENG1, JINXIAN WANG1, XIANGTING DONG1

Affiliation

  1. School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China.P.R.China

Abstract

The core-shell structured bifunctional magnetic and up-conversion fluorescence nanoparticles composed of Fe3O4 magnetic core and GdF3:Er3+,Yb3+ up-conversion fluorescent shell were fabricated by a facile direct precipitation method. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), photoluminescence (PL), and superconducting quantum interface device (SQUID) were employed to characterize the samples. The results show that the composite nanoparticles are core-shell structures and have a typical diameter of 60 nm consisting of the magnetic core with about 40 nm in diameter and up-conversion fluorescent nanocrystals with an average thickness of about 15~20 nm. They possess magnetism with a saturation magnetization of 6.98 emu/g and exhibit green and red emissions originating from electric transition 4 S3/2 -4 I15/2 (543 nm) and 4 F9/2 - 4 I15/2 (659 nm) of Er3+ ions. These results suggest that the bifunctional magnetic and up-conversion fluorescence nanocomposites with magnetic resonance response and up-conversion fluorescence probe property may be useful in biomedical imaging and diagnostic applications..

Keywords

Fe3O4, GdF3:Er3+,Yb3+, Core-shell, Magnetism, Up-conversion fluorescence.

Submitted at: Feb. 25, 2012
Accepted at: April 11, 2012

Citation

GUIXIA LIU, HONGXIA PENG, JINXIAN WANG, XIANGTING DONG, Fe3O4@GdF3:Er3+,Yb3+ nanoparticles: synthesis and bifunctional properties, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 3-4, pp. 205-209 (2012)