Vacuum-ultraviolet absorption of amorphous SiO2: intrinsic disorder and role of silanol groups

Risultato della ricerca: Article

17 Citazioni (Scopus)

Abstract

We present a study on the vacuum-ultraviolet VUV absorption properties of amorphous SiO2 a-SiO2 withhigh concentrations of silanol groups Si-OH . We found that the absorption spectra are made up of a coupleof exponential profiles. The first, in the range from 7.5 to 8.1 eV, was attributed to Si-OH group absorption,while the second, in the range from 8.1 to 8.25 eV, was ascribed to the intrinsic absorption. The VUVabsorption cross section of Si-OH groups in a-SiO2 was determined as well. The intrinsic absorption was foundto be affected by the Si-OH concentration: high silanol group contents allow lower values of the Urbachenergy. This result is interpreted in terms of a reduction in the degree of disorder in wet materials.
Lingua originaleEnglish
pagine (da-a)165203-1-165203-6
Numero di pagine6
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume77
Stato di pubblicazionePublished - 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Entra nei temi di ricerca di 'Vacuum-ultraviolet absorption of amorphous SiO2: intrinsic disorder and role of silanol groups'. Insieme formano una fingerprint unica.

Cita questo