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NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
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Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
IJPAP Vol.44(02) [February 2006] >
| Title: | Low frequency phonons in nanoparticles |
| Authors: | Jha, Prafulla K |
| Keywords: | Phonons
Acoustic
Nanoparticles
Raman spectra
Damping |
| Issue Date: | Feb-2006 |
| Publisher: | CSIR |
| IPC Code: | B82B |
| Abstract: | The consequence of the phonon confinement on the phonon
spectra particularly the low frequency spectra in nanocrystal quantum dots has
been investigated. Due to the phonon confinement effect, there appears
spheroidal and quadrupolar modes of nanoparticles in the low frequency spectra.
The frequency of these modes increases with the decrease of the size of the
nanocrystal quantum dot (nanoparticle). The effect of surrounding medium on the
phonon spectra of the nanoparticles, which is observed as the broadening of the
phonon line shape due to the acoustic mismatch at the surface of the
nanoparticles has also been discussed. The effect of density of the surrounding
medium on the phonon modes has been discussed and the results on the damping
constant and quality factor have been studied. |
| Page(s): | 87-92 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.44(02) [February 2006]
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