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Updated: May 23, 2026

Preparation of Silica Nanoparticles Through Microwave-assisted Acid-catalysis
Published on: December 16, 2013
Ultraviolet photoluminescence of silanol species in mesoporous silica
Carlo M Carbonaro1, Francesca Clemente, Riccardo Corpino
1Dipartimento di Fisica, Università di Cagliari and INFM UdR Cagliari, Cittadella Universitaria, SP no 8 Km 0.700, I-09042 Monserrato (Ca), Italy. cm.carbonaro@dsf.unica.it
Abstract:
The optical properties of sol-gel synthesized porous silica excited by synchrotron radiation in the 4-10 eV range of samples with different porosity at 8 K and room temperature are reported. The analysis of the ultraviolet photoluminescence indicate the contributions of two different emitting centers. The spectral and temporal characteristics of the two luminescence bands are reported: emission peaks at about 3.7 and 4.0 eV, excitation channels around 5.4-5.7 and 6.2-6.5 eV, and mean lifetimes of about 17 and 2 ns, respectively. The analysis of the optical properties in samples with different porosity allows us to propose a silanol-related model for the two centers.
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