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  • Title: Synthesis, texture, and photoluminescence of lanthanide-containing chitosan-silica hybrids.
    Author: Liu F, Carlos LD, Ferreira RA, Rocha J, Ferro MC, Tourrette A, Quignard F, Robitzer M.
    Journal: J Phys Chem B; 2010 Jan 14; 114(1):77-83. PubMed ID: 19968320.
    Abstract:
    Three different types of photoluminescent hybrid materials containing trivalent lanthanide (Ln(3+) = Eu(3+), Tb(3+)) ions, chitosan, and silica have been prepared with different structural features. The different silica sources lead to diverse microstructures of hybrid materials, with silica being homogeneously dispersed in the chitosan materials (LnChS-H), or forming a core-shell morphology. Postsynthesis treatment is necessary for embedding the luminescent probe. The Ln(3+)-based materials have been investigated by photoluminescence spectroscopy (12-300 K). The chitosan-Eu(3+)-related local environment is maintained in the EuChS-H hybrid material. The emission features of the core-shell materials are characterized by the presence of two Eu(3+) distinct local environments, one associated with the chitosan core and the other with the silica shell.
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