Entrapping of O2 Molecules in Nanostructured Silica Probed by Photoluminescence

Risultato della ricerca: Articlepeer review

20 Citazioni (Scopus)


We 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.
Lingua originaleEnglish
pagine (da-a)2616-2622
Numero di pagine7
Stato di pubblicazionePublished - 2013

All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.2100.2100???
  • ???subjectarea.asjc.1600.1606???
  • ???subjectarea.asjc.2500.2508???


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