NDLI: Optical and acoustic phonon modes confined in gallium phosphide nanoparticles

Content Provider	Springer Nature Link
Author	Zhang, Zhaochun Zhang, Neng
Copyright Year	2010
Abstract	The main aim of this paper is to discuss the confinement effects on the optical and acoustic phonon vibrational modes in gallium phosphide (GaP) nanoparticles (cylindric grain). The Raman scattering from the GaP nanoparticles was investigated. It was found that the red-shifts of the longitudinal optical (LO) mode and transverse optical (TO) mode were 15 cm$^{−1}$ and 13.8 cm$^{−1}$, respectively. It is generally accepted that the red-shifts of the optical phonon modes are due to the presence of smaller nanosized particles (∼1.2 nm) acting as the nanoclustered building blocks of the GaP nanoparticles. In the low frequency Raman spectrum, a set of Stokes lines with almost the same spacing was clearly observed. The scattering feature originates from the discrete phonon density of states of the nanoclustered building blocks. According to Lamb’s vibrational theory, the Raman shift wavenumbers of the spheroidal mode and torsional mode of the lowest energy surface modes for the nanoclustered building blocks were calculated. Good agreement can be achieved between the calculated results and the observed scattering peaks. These results indicate that the corresponding Raman peaks are due to scattering from the localized acoustic phonons in the nanoclustered building blocks in the GaP nanoparticles.
Starting Page	561
Ending Page	566
Page Count	6
File Format	PDF
ISSN	10010521
Journal	Rare Metals
Volume Number	29
Issue Number	6
e-ISSN	18677185
Language	English
Publisher	University of Science and Technology Beijing
Publisher Date	2010-11-20
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	spectroscopy phonon mode Raman scattering gallium phosphide nanoparticles confinement effects Physical Chemistry Inorganic Chemistry Ceramics, Glass, Composites, Natural Methods Nanotechnology Metallic Materials Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Physical and Theoretical Chemistry Condensed Matter Physics

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