Authors: Davion, B.; Delhorbe, V.; Péralta, S.; Goubard, F.; Vidal, F.

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 4, April 2011 , pp. 3208-3214(7)

Publisher: American Scientific Publishers

Abstract:

Gd₂O₃:Tb(5%) nanoparticles were prepared via the polyol route and dispersed without any stabilizer in several ethyl methacrylate derivatives matrices such as poly(ethyl methacrylate), poly(2-methoxyethyl methacrylate) and poly(2-hydroxyethyl methacrylate) (PHEMA). Nanocomposites were obtained via free-radical polymerization of methacrylic monomers with ethylene glycol dimethacrylate as crosslinker and colloidal solution of Gd₂O₃:Tb(5%) nanoparticles. Best results are obtained with PHEMA in which the dispersed Gd₂O₃:Tb(5%) nanoparticles are spherical with a mean diameter of 15 nm, as measured by TEM. The obtained solid Gd₂O₃:Tb(5%)/PHEMA nanocomposites are highly transparent (in the visible spectral range) and exhibit characteristic photoluminescence of Tb^{3+ 5}D₄-⁷F_J (J = 6-3), with ⁵D₄-⁷F₅ strong green emission at 536 nm upon UV excitation. The nanoparticles and nanocomposites have been well characterized by high-resolution transmission electron microscope (TEM), UV/Vis transmission spectra, photoluminescence excitation, and emission spectra.

Keywords: NANOCOMPOSITE; PHEMA; LANTHANIDE OXIDE; NANOPARTICLE DISPERSION; QUENCHING EFFECT

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2011.3595

Publication date: 2011-04-01

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