Raman spectra of CdS nanocrystals in Nafion: longitudinal optical and confined acoustic phonon modes

被引：83
作者：
Nandakumar, P
Vijayan, C [1 ]
Rajalakshmi, M
Arora, AK
Murti, YVGS
机构：
[1] Indian Inst Technol, Dept Phys, Madras 600036, Tamil Nadu, India
[2] Indira Gandhi Ctr Atom Res, Div Mat Sci, Kalpakkam 603102, Tamil Nadu, India
[3] Indian Inst Technol, Dept Phys, Gauhati 781001, India
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2001年 / 11卷 / 04期
关键词：
semiconductor quantum dots; Raman spectra; LO-phonon modes; acoustic phonons; strong confinement;
D O I：
10.1016/S1386-9477(01)00157-6
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Quantum confinement effects on the longitudinal optical and acoustic phonons in US nanocrystals in the strongly confined regime in the polymer matrix Nafion are studied using Raman spectroscopy. The LO-phonon modes show size-dependent asymmetric broadening though the broadening and asymmetry are less than those predicted by the phonon confinement models. Two types of confined acoustic modes corresponding to n = 1, l = 0 and n = 1, l = 2 spheroidal vibrations are observed. Softening of the spheroidal modes is observed in the strongly confined regime. (C) 2001 Elsevier Science B.V. All rights reserved.
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收藏
页码：377 / 383
页数：7
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