Phonon confinement effect on nanocrystalline LiCoO2 studied with Raman spectroscopy

被引：11

作者：

Okubo, M. ^{[1
,2
]}

Hosono, E. ^{[1
]}

Kudo, T. ^{[1
]}

Zhou, H. S. ^{[1
]}

Honma, I. ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3050012, Japan

[2] Chuo Univ, Fac Sci & Engn, Dept Appl Chem, Bunkyo Ku, Tokyo 1128551, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2008年 / 69卷 / 11期

关键词：

Ceramics; Raman spectroscopy; Phonons;

D O I：

10.1016/j.jpcs.2008.08.009

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A systematic investigation on nanocrystalline LiCoO2 has been carried Out using Raman spectroscopy. We synthesized nanocrystalline LiCoO2 (ca. 20-50 nm) through a combination of rapid thermal annealing at various annealing temperatures and a sol-gel method assisted with a triblock copolymer surfactant. Powder X-ray diffraction measurements revealed the formation Of LiCoO2. The crystallite size of LiCoO2 from the Scheffer equation strongly depended on the annealing temperature. The crystallite size was confirmed by SEM and TEM measurements. Raman shifts of the A(1g) and E-g modes for nanocrystalline LiCoO2 exhibited a broadening and a frequency shift according to the crystallite size. While the frequency Shift Could be ascribed to a Structural strain at the surface, the broadening was clue to the phonon confinement effect produced by narrow crystal boundaries. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2911 / 2915

页数：5

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