Phonon confinement and size effect in Raman spectra of ZnO nanoparticles

Vitaly I. Korepanov; Si-Yuan Chan; Hsu-Cheng Hsu; Hiro-o Hamaguchi

Heliyon (Feb 2019)

Phonon confinement and size effect in Raman spectra of ZnO nanoparticles

Vitaly I. Korepanov,
Si-Yuan Chan,
Hsu-Cheng Hsu,
Hiro-o Hamaguchi

Affiliations

Vitaly I. Korepanov: Institute of Microelectronics Technology and High Purity Materials, RAS, Chernogolovka 142432, Russia; Corresponding author.
Si-Yuan Chan: Department of Photonics, National Cheng Kung University, Tainan 700, Taiwan
Hsu-Cheng Hsu: Department of Photonics, National Cheng Kung University, Tainan 700, Taiwan
Hiro-o Hamaguchi: Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 300, Taiwan; Corresponding author.

Journal volume & issue: Vol. 5, no. 2
p. e01222

Abstract

Read online

We study Raman spectra of ZnO nanoparticles of 5–12 nm size in the whole range of the first-order phonon bands. We apply the 3D phonon confinement model (PCM) for the interpretation of the observed Raman spectra. It is found that PCM is well applicable to the acoustic modes as well as to the optical ones, despite the fact that PCM has been thought not to be suitable for acoustic phonons. We show that the asymptotic behavior of PCM for the small-size limit is more consistent with the observation than that of the elastic sphere model (ESM). Furthermore, PCM gives detailed information on the complex size-dependent shapes of the phonon bands.

Materials science

Published in Heliyon

ISSN: 2405-8440 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Science: Science (General); Social Sciences: Social sciences (General)
Website: https://www.cell.com/heliyon/home

About the journal

Abstract

Keywords