Infrared vibration studies of nanometer-sized Fe2O3 arrays

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	Infrared vibration studies of nanometer-sized Fe2O3 arrays
	Zou, BS ; Wang, JP ; Green, T ; Little, R
刊名	PHYSICS OF LOW-DIMENSIONAL STRUCTURES
	2001
卷号	5-6 页码:87
关键词	NANOPARTICLES ABSORPTION CRYSTALS
ISSN号	0204-3467
通讯作者	Zou, BS: Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China.
中文摘要	The polarized Fourier transform infrared (FTIR) spectroscopy is used to study the surface-capped Fe2O3 nanoparticles and nanoparticle arrays. The independent manometer-sized Fe2O3 crystals show typical confined phonon mode in relation to the, alpha -Fe2O3 phase. For the aggregates on different substrates the FTIR showed different behavior as compared with the isolated dispersions in KBr pellets, on the surface of Si wafer with those close-packed on the surface of KBr pellets and on the surface of Si wafers. The vibration mode variations in these spectra are discussed in terms of the enhancement of multipolar interactions, vibrational anisotropy and long-range electron-phonon interactions, as well as magnetic coupling. Clear longitudinal optic phonon (LO) and transverse optic phonon (TO) splitting in the spectra of aggregate on the surface of. KBr pellets indicating a long-range order array is observed. Magnetic coupling as an additional term of multipolar coupling enhancement may play an important role in the nanocrystal ordering. The observed contributions from ordered coupling are in contrast to a model by Gerardy and Ausloos, in which the Frohlich modes are dominant for isotropic nanoparticle aggregation, because Fe2O3 crystal has anisotropic structure due to the magnetic couplings. However, their model applies for our particle aggregates upon exposure to air for a few days and for samples with large size distribution, in which the temporal dipolar interaction is dominant. This spectral variation indicates a transformation from ordered magnetic arrays to a Frohlich (charge-fluctuation)-like aggregates.
收录类别	SCI
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/39970]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zou, BS,Wang, JP,Green, T,et al. Infrared vibration studies of nanometer-sized Fe2O3 arrays[J]. PHYSICS OF LOW-DIMENSIONAL STRUCTURES,2001,5-6:87.
APA	Zou, BS,Wang, JP,Green, T,&Little, R.(2001).Infrared vibration studies of nanometer-sized Fe2O3 arrays.PHYSICS OF LOW-DIMENSIONAL STRUCTURES,5-6,87.
MLA	Zou, BS,et al."Infrared vibration studies of nanometer-sized Fe2O3 arrays".PHYSICS OF LOW-DIMENSIONAL STRUCTURES 5-6(2001):87.