Mossbauer studies of nano-size controlled iron oxide for biomedical applications

被引:9
作者
Lee, SW [1 ]
Kim, SJ
Shim, IB
Bae, S
Kim, CS
机构
[1] Kookmin Univ, Dept Phys, Seoul 136702, South Korea
[2] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore
基金
新加坡国家研究基金会;
关键词
bio-medical applications; magnetite; Mossbauer spectroscopy; nanoparticles; superparamagnetism;
D O I
10.1109/TMAG.2005.855337
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We present the magnetic properties and the material characteristics of magnetite (Fe3O4), which was successfully prepared by using the reaction of iron(III) acetylacetonate [Fe(acac)(3)] with surfactants at high temperature (so called by "high temperature decomposition method"). According to the results of high resolution transmission electron microscopy (HRTEM) analysis, the prepared iron oxide particles had the average particle sizes between 4 and 6 nm and very uniform size distributions. The crystal structure analyzed by using both XRD and Mossbauer spectra confirmed that the prepared iron oxide nanoparticles only have single magnetite (Fe3O4) crystal phase. The typical superparamagnetic behaviors were observed from the prepared iron-oxide nanoparticles. In addition, they showed the saturation magnetization, MS of 59.5 emu/g for 4 nm, and of 59.7 emu/9 for 6 nm, respectively at room temperature under the externally applied magnetic field of 10 kOe. The measured Wssbauer spectrum at 4.2 K was fitted using two magnetic components: (1) hyperfine fields H-hf = 514 and 492 kOe, (2) isomer shifts delta = 0.35 and 0.73 mm/s. The fitted data apparently verified that the prepared iron oxide samples only have pure magnetite ([Fe3+](A) [Fe2+Fe3+](B)O-4).
引用
收藏
页码:4114 / 4116
页数:3
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