Synthesis, texture, and photoluminescence of lanthanide-containing chitosan-silica hybrids.
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.
Liu
Fengyi
F
Department of Physics, CICECO, University of Aveiro, Portugal.
Carlos
Luis D
LD
Ferreira
Rute A S
RA
Rocha
João
J
Ferro
Marta C
MC
Tourrette
Audrey
A
Quignard
Françoise
F
Robitzer
Mike
M
D048271:Chitosan / Q000737:chemistry*; D005063:Europium / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D012822:Silicon Dioxide / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
D028581:Lanthanoid Series Elements; D005063:Europium; D012822:Silicon Dioxide; D048271:Chitosan