We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Structural properties of core and surface of silica nanoparticles investigated by Raman spectroscopy.
- Authors
Alessi, A.; Agnello, S.; Buscarino, G.; Gelardi, F. M.
- Abstract
We studied the experimental Raman spectra of various commercial silica nanoparticles of average diameter from 7 to 40 nm and specific surface from 50 to 380 m2/g. We found that the peculiarities of the particles Raman spectra systematically depend on their specific surface. In detail, the peak position of the R band at about 440 cm−1 shifts towards high wavenumbers following an almost linear dependence on the specific surface. Similarly, the amplitudes of the D1 and D2 bands, at about 495 and 605 cm−1, respectively, increase linearly with the same quantity. Our results are interpreted in the frame of the shell model for the nanoparticles clarifying that the network of the core of the nanoparticles is comparable to the bulk silica materials, whereas the surface shell has a ring statistic shifted to the low member rings and features an higher density. Copyright © 2013 John Wiley & Sons, Ltd.
- Subjects
RAMAN spectroscopy; SILICA nanoparticles; CRYSTAL structure; SURFACE chemistry; STRUCTURAL shells
- Publication
Journal of Raman Spectroscopy, 2013, Vol 44, Issue 6, p810
- ISSN
0377-0486
- Publication type
Article
- DOI
10.1002/jrs.4292