Photoluminescence and Raman measurements have been performed on sol-gel synthesized porous silica monoliths. Porous silica and polyethilenglycole/silica hybrids thermally treated at different temperatures have been analyzed. By exciting at 5.6 eV a structured photoluminescence emission centered at 3.7 eV is found in the whole set of samples. Hydration treatment of the pore surfaces increases the H-bonding interaction between silanols, inhibits the isolated silanols vibrations and changes the photoluminescence spectrum increasing the emission peaked at 3.7 eV. (C) 2003 Elsevier B.V. All rights reserved.
OH-dependence of ultraviolet emission in porous silica
ANEDDA, ALBERTO;CARBONARO, CARLO MARIA;CORPINO, RICCARDO;
2003-01-01
Abstract
Photoluminescence and Raman measurements have been performed on sol-gel synthesized porous silica monoliths. Porous silica and polyethilenglycole/silica hybrids thermally treated at different temperatures have been analyzed. By exciting at 5.6 eV a structured photoluminescence emission centered at 3.7 eV is found in the whole set of samples. Hydration treatment of the pore surfaces increases the H-bonding interaction between silanols, inhibits the isolated silanols vibrations and changes the photoluminescence spectrum increasing the emission peaked at 3.7 eV. (C) 2003 Elsevier B.V. All rights reserved.
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