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|title: ||Luminescent SiO(2)-coated Gd(2)O(3):Eu(3+) nanorods/poly(styrene) nanocomposites by in situ polymerization|
|authors: ||Macedo, Andreia G.|
Martins, Manuel A.
Fernandes, Silvia E. M.
Carlos, Luis D.
|issue date: ||Oct-2010|
|abstract: ||Europium doped gadolinium oxide nanorods have been coated with silica via a sol–gel approach. The silica
coating increases the Eu3+ absolute emission quantum yields from 0.51 to 0.86 (255 nm excitation)
and decay times from 1.43 to 1.80 ms (394.4 nm excitation). Subsequently the silica coating was modified
with 3-(trimethoxysilyl)-propyl-methacrylate. Grafting of silica with the MPS coupling agent was confirmed
by FTIR and contact angle measurements. The functionalized nanoparticles were used as core
structures in the in situ radical polymerization of styrene via miniemulsion and solution routes. Depending
on the polymerization technique used the morphology of the polymer coating consisted in isolated
spheres or a homogenous film respectively. Although the optical properties of the ensuing nanocomposites
were reduced the synthetic strategy developed to process this type of luminescent nanoparticles
proved efficient and can be explored using different vinyl or (meth)acrylate monomers.|
|publisher version/DOI: ||dx.doi.org/10.1016/j.optmat.2010.05.020|
|source: ||Optical Materials|
|appears in collections||DQ - Artigos|
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