Surface atomic structures of Fe2O3 nanoparticles coated with cetyltrimethyl ammonium bromide and sodium dodecyl benzene sulphonate: an extended x-ray absorption fine-structure study

	Surface atomic structures of Fe2O3 nanoparticles coated with cetyltrimethyl ammonium bromide and sodium dodecyl benzene sulphonate: an extended x-ray absorption fine-structure study
	Wu ZH(吴忠华); Guo L(郭林); Wu, ZH; Guo, L; Li, QS; Zhu, HS
刊名	JOURNAL OF PHYSICS-CONDENSED MATTER
	1999
卷号	11 期号:26 页码:4961-4970
通讯作者	Chinese Acad Sci, Beijing Synchrotron Radiat Lab, Inst High Energy Phys, Beijing 100039, Peoples R China ; Beijing Inst Technol, Coll Chem Engn & Mat Sci, Beijing 100081, Peoples R China
英文摘要	Fe2O3 nanoparticles coated with sodium dodecyl benzene sulphonate (DBS) or cetyltrimethyl ammonium bromide (CTAB) were prepared by using a microemulsion method in the system water/toluene. The nanoparticles were characterized by means of transmission electron microscopy and average particle sizes of 5.0 nm and 6.0 nm were found for DBS-modified and CTAB-modified nanoparticles respectively. The local atomic structures of these iron(In) oxide nanoparticles were probed by using the extended x-ray absorption fine-structure technique. Fe K absorption spectra were collected at beam line 4W1B of Beijing Synchrotron Radiation Facility. A structural model was proposed for describing their atomic structures. The Fed bond length at the surface of DBS-coated Fe2O3 nanoparticles was found to be similar to that in bulk Fe2O3, but there was about 0.04 A expansion for the CTAB-coated Fe2O3 nanoparticles. On the basis of the model proposed in this paper, the thicknesses of the surface layers were estimated to be 0.5 nm and 0.7 nm, respectively, for the DBS-coated and CTAB-coated Fe2O3 nanoparticles. The anharmonicity of the atomic vibration and the asymmetry of atom-pair distribution were found to be larger at the surface of the nanoparticles than in the bulk material, while the Debye-Waller factors are almost the same for the surface and the core parts of the nanoparticles. It can be concluded that the atomic structure of the nanoparticle surface is ordered, but the atom-pair distribution is asymmetric.
学科主题	Physics
类目[WOS]	Physics, Condensed Matter
研究领域[WOS]	Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000081505600004
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/240004]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Wu ZH,Guo L,Wu, ZH,et al. Surface atomic structures of Fe2O3 nanoparticles coated with cetyltrimethyl ammonium bromide and sodium dodecyl benzene sulphonate: an extended x-ray absorption fine-structure study[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,1999,11(26):4961-4970.
APA	吴忠华,郭林,Wu, ZH,Guo, L,Li, QS,&Zhu, HS.(1999).Surface atomic structures of Fe2O3 nanoparticles coated with cetyltrimethyl ammonium bromide and sodium dodecyl benzene sulphonate: an extended x-ray absorption fine-structure study.JOURNAL OF PHYSICS-CONDENSED MATTER,11(26),4961-4970.
MLA	吴忠华,et al."Surface atomic structures of Fe2O3 nanoparticles coated with cetyltrimethyl ammonium bromide and sodium dodecyl benzene sulphonate: an extended x-ray absorption fine-structure study".JOURNAL OF PHYSICS-CONDENSED MATTER 11.26(1999):4961-4970.