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Magnetic and luminescent hybrid nanomaterial based on Fe(3)O(4) nanocrystals and GdPO(4):Eu(3+) nanoneedles.

Runowski M, Grzyb T, Lis S - J Nanopart Res (2012)

Bottom Line: A magnetic phase was synthesized as a core/shell type composite.Also, the luminescent phase can move simultaneously with magnetite due to a "trapping" effect.GRAPHICAL ABSTRACT:

View Article: PubMed Central - PubMed

Affiliation: Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland.

ABSTRACT
A bifunctional hybrid nanomaterial, which can show magnetic and luminescent properties, was obtained. A magnetic phase was synthesized as a core/shell type composite. Nanocrystalline magnetite, Fe(3)O(4) was used as the core and was encapsulated in a silica shell. The luminescent phase was GdPO(4) doped with Eu(3+) ions, as the emitter. The investigated materials were synthesized using a coprecipitation method. Encapsulated Fe(3)O(4) was "trapped" in a nano-scaffold composed of GdPO(4) crystalline nanoneedles. When an external magnetic field was applied, this hybrid composite was attracted in one direction. Also, the luminescent phase can move simultaneously with magnetite due to a "trapping" effect. The structure and morphology of the obtained nanocomposites were examined with the use of transmission electron microscopy and X-ray powder diffraction. Spectroscopic properties of the Eu(3+)-doped nanomaterials were studied by measuring their excitation and emission spectra as well as their luminescence decay times. GRAPHICAL ABSTRACT:

No MeSH data available.


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Luminescence decays of Eu3+ in Fe3O4/SiO2–GdPO4:Eu3+ observed at λem = 589 nm and excited at λex = 245 nm
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Fig8: Luminescence decays of Eu3+ in Fe3O4/SiO2–GdPO4:Eu3+ observed at λem = 589 nm and excited at λex = 245 nm

Mentions: Emission decay curves of the prepared materials are presented in Fig. 8. The obtained curves were both fitted to biexponential decays with good correlation coefficients. The two lifetimes originate from two different Eu3+ ions, occupying sites inside the nanocrystals and on their surface, where the ions are surrounded by different environments. Their values are typical for Eu3+ in inorganic hosts (Liu et al. 2007; Wiglusz et al. 2010), and both are shortened in samples with higher concentrations of Eu3+. The shorter lifetimes are due to the concentration quenching.Fig. 8


Magnetic and luminescent hybrid nanomaterial based on Fe(3)O(4) nanocrystals and GdPO(4):Eu(3+) nanoneedles.

Runowski M, Grzyb T, Lis S - J Nanopart Res (2012)

Luminescence decays of Eu3+ in Fe3O4/SiO2–GdPO4:Eu3+ observed at λem = 589 nm and excited at λex = 245 nm
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3473191&req=5

Fig8: Luminescence decays of Eu3+ in Fe3O4/SiO2–GdPO4:Eu3+ observed at λem = 589 nm and excited at λex = 245 nm
Mentions: Emission decay curves of the prepared materials are presented in Fig. 8. The obtained curves were both fitted to biexponential decays with good correlation coefficients. The two lifetimes originate from two different Eu3+ ions, occupying sites inside the nanocrystals and on their surface, where the ions are surrounded by different environments. Their values are typical for Eu3+ in inorganic hosts (Liu et al. 2007; Wiglusz et al. 2010), and both are shortened in samples with higher concentrations of Eu3+. The shorter lifetimes are due to the concentration quenching.Fig. 8

Bottom Line: A magnetic phase was synthesized as a core/shell type composite.Also, the luminescent phase can move simultaneously with magnetite due to a "trapping" effect.GRAPHICAL ABSTRACT:

View Article: PubMed Central - PubMed

Affiliation: Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland.

ABSTRACT
A bifunctional hybrid nanomaterial, which can show magnetic and luminescent properties, was obtained. A magnetic phase was synthesized as a core/shell type composite. Nanocrystalline magnetite, Fe(3)O(4) was used as the core and was encapsulated in a silica shell. The luminescent phase was GdPO(4) doped with Eu(3+) ions, as the emitter. The investigated materials were synthesized using a coprecipitation method. Encapsulated Fe(3)O(4) was "trapped" in a nano-scaffold composed of GdPO(4) crystalline nanoneedles. When an external magnetic field was applied, this hybrid composite was attracted in one direction. Also, the luminescent phase can move simultaneously with magnetite due to a "trapping" effect. The structure and morphology of the obtained nanocomposites were examined with the use of transmission electron microscopy and X-ray powder diffraction. Spectroscopic properties of the Eu(3+)-doped nanomaterials were studied by measuring their excitation and emission spectra as well as their luminescence decay times. GRAPHICAL ABSTRACT:

No MeSH data available.


Related in: MedlinePlus