Archivio istituzionale della ricerca dell'Università degli Studi di Palermo
IRIS è il sistema di gestione integrata dei dati della ricerca (persone, pubblicazioni, progetti, attività) adottato dall’Università di Palermo, e ha lo scopo di raccogliere, conservare, documentare, e diffondere ad accesso aperto le informazioni relative alla produzione scientifica degli autori afferenti all’Ateneo.
EnglishWe studied the emission of the O2 molecules embedded in fumed silica (amorphous silicon dioxide) nanoparticles differing for diameters and specific surface. By using a 1064 nm laser as a source we recorded both the O2 emission and the Raman signal of silica. Our experimental data show that the O2 emission/Raman signal (at 800cm-1) ratio decreases with increasing the specific surface both for the as received and the loaded samples. By performing a thermal treatment (600 °C for 2h) we modified the structure and the water content of the smallest nanoparticles without observing any significant change in the O2 emission/Raman signal ratio. Our data are explained by a shell model showing that the O2 emission is essentially due to the molecules entrapped in the core of the nanoparticles, whereas the contribution due to the surface shell, having a thickness of about 1 nm, is negligible because of its high content of Si-OH groups that introduce non-radiative relaxation channels or because of the very low content of molecules trapped in this thin region.
Alessi, A., Iovino, G., Buscarino, G., Agnello, S., & Gelardi, F. (2013). Entrapping of O2 Molecules in Nanostructured Silica Probed by Photoluminescence. JOURNAL OF PHYSICAL CHEMISTRY. C, 117(6), 2616-2622.
| Data di pubblicazione: | 2013 |
| Titolo: | Entrapping of O2 Molecules in Nanostructured Silica Probed by Photoluminescence |
| Autori: | |
| Citazione: | Alessi, A., Iovino, G., Buscarino, G., Agnello, S., & Gelardi, F. (2013). Entrapping of O2 Molecules in Nanostructured Silica Probed by Photoluminescence. JOURNAL OF PHYSICAL CHEMISTRY. C, 117(6), 2616-2622. |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1021/jp310314t |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
File in questo prodotto:
http://hdl.handle.net/10447/70443
Copyright © 2021