Temperature dependence of the lowest frequency Eg Raman mode in laser-synthesized anatase TiO2 nanopowder

被引：53

作者：

Scepanovic, M. J. ^{[1
]}

Grujic-Brojcin, M. ^{[1
]}

Dohcevic-Mitrovic, Z. D. ^{[1
]}

Z, V. Popovic ^{[1
]}

机构：

[1] Ctr Solid State Phys & New Mat, Inst Phys, Belgrade 11080, Serbia

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2007年 / 86卷 / 03期

关键词：

D O I：

10.1007/s00339-006-3775-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanosized titanium dioxide (TiO2) powder was prepared by a laser-induced pyrolysis. Specific surface area of the as-grown powder measured by BET method was 109 m(2)/g. The grain size (14.5 nm) estimated from these data coincides well with the crystallite size (12.3 nm) determined by XRD measurements. The average grain size (similar to 35 nm) obtained from the subsequent SEM measurements refers to considerable agglomeration of nanoparticles. Raman spectroscopy has been used to investigate the structural properties of TiO2 nanopowder and its anatase structure is confirmed. The blueshift and broadening of the lowest frequency E-g Raman mode at temperature range similar to 25 - 550 K have been analyzed using a phonon-confinement model. Dominant influence of the strong anharmonic effect at higher temperatures was demonstrated.

引用

页码：365 / 371

页数：7

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