Otro
Rare earth doped synthetic opals and inverse opals
Registro en:
Sol-gel Optics Vi. Bellingham: Spie-int Soc Optical Engineering, v. 4804, p. 121-129, 2002.
0277-786X
10.1117/12.456543
WOS:000180000400016
Autor
Bueno, L. A.
Bertholdo, R.
Barros, D. A.
Messaddeq, Younes
Ribeiro, SJL
Pope, EJA
Schmidt, H. K.
Dunn, B. S.
Shibata, S.
Resumen
Monodisperse spheres of silica and latex were obtained by a surfactant free styrene polimerization and the Stober method respectively. Controlling settling either by centrifugation or by dip-coating colloidal crystals could be obtained. Silica inverse opals were prepared by using the latex colloidal crystals as templates and TEOS/ethanol solution. Eu3+ containing silica spheres were obtained dispersing silica spheres in Eu(NO3)(3) isopropanol solutions. Emission spectra suggest the formation of an amorphous Eu3+ containing phase well adhered at the spheres surface. The utilization of solutions of trifluoroacetates salts of Pb2+ and Eu3+ was observed to destroy the silica spherical pattern when samples are treated at 1000degreesC. In that case nanocrystals of PbF2 and amorphous silica were obtained after heat treatment.