Preparation and characterization of silica coated iron oxide magnetic nano-particles

被引：123

作者：

Li, Ying-Sing ^{[1
]}

Church, Jeffrey S. ^{[2
]}

Woodhead, Andrea L. ^{[2
]}

Moussa, Filsun ^{[1
]}

机构：

[1] Univ Memphis, Dept Chem, Memphis, TN 38152 USA

[2] CSIRO Mat Sci & Engn, Belmont, Vic 3216, Australia

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2010年 / 76卷 / 05期

关键词：

Iron oxide nano-particles; Silica coated; Mercaptopropylsilyl coated; Infrared spectra; Raman spectra; FE3O4; NANOPARTICLES; SOL-GEL; SPECTROSCOPY; SPECTRA;

D O I：

10.1016/j.saa.2010.04.004

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Iron oxide magnetic nano-particles have been prepared by precipitation in an aqueous solution of iron(II) and iron(III) chlorides under basic condition. Surface modifications have been carried out by using tetraethoxysilane (TEOS) and mercaptopropyltrimethoxysilane (MPTMS). The uncoated and coated particles have been characterized with transmission electron microscopy (TEM), energy dispersive X-ray (EDX) spectroscopy, thermal gravimetric analysis (TGA), and infrared (IR) and Raman spectroscopy. The particle sizes as measured from TEM images were found to have mean diameters of 13 nm for the uncoated and about 19 nm for the coated particles. The measured IR spectra of the uncoated and MPTMS coated particles showed the conversion of magnetite to hematite at high temperature. The results obtained from both IR spectroscopy and TGA revealed that the mercaptopropylsilyl group in the MPTMS coated magnetite decomposed at 600 degrees C and the silica layer of the TEOS coated magnetite was rather stable. Raman spectroscopy has shown the laser heating effect through the conversion of magnetite to maghemite and hematite. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：484 / 489

页数：6

共 38 条

[31] Raman spectroscopic study of magnetite (FeFe2O4):: a new assignment for the vibrational spectrum [J].