Optical phonons and Raman scattering in ternary II–VI spheroidal nanocrystals embedded in a glass matrix |
| |
| Affiliation: | 1. Instituto de Física, Universidade Federal de Uberlândia, 38400-902 Uberlândia, MG, Brazil;2. Instituto de Física, Univesidade de São Paulo, 05315-970 São Paulo, SP, Brazil;3. Departamento de Física, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil;4. Departamento de Física Teórica, Universidad de la Habana, Vedado, 104000 Havana, Cuba;1. Departamento de Fisicá, Universidade Estadual de Maringá, Maringá, PR, Brazil;2. Departamento de Fisicá, Universidade Estadual de Maringá, Maringá, PR, Brazil;3. Departamento de Engenharia de Materiais, Vitreous Materials Laboratory, Universidade Federal de São Carlos, São Carlos, SP, Brazil |
| |
| Abstract: | Theoretical and experimental studies of the spatial phonon confinement in ternary CdSxSe1−x nanocrystals embedded in a glass matrix formed by the composites (40)SiO2−(30)Na2CO3–(29)B2O3–(1)Al2O3 (mol%) + [(2)CdO + (2)S + (2)Se] (wt%) were carried out. From the analysis of the surface phonon modes, the theoretical procedure has allowed the determination of the geometrical characteristics of the nanocrystals. The calculated frequencies were compared with the experimental values obtained from the Raman spectra of CdSxSe1−x nanocrystals grown under different thermal treatments. A good correlation between the experimental and calculated CdS-like and CdSe-like surface optical modes was observed. The Raman selection rules and their connection with the nature of the surface optical phonons is discussed in order to use Raman spectroscopy as a probe to determine the composition x and the geometrical shape of the semiconductor nanocrystals. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
