Synthesis and Characterization of Superparamagnetic Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>Core-Shell Composite Nanoparticles

• 作者: Bingjun Yang Jingwei Dong Meizhen Gao Wen Li Zhirong Zhang
• 来源期刊: 凝固态物理国际期刊(英文)
• 学科: 化学
• 关键词: MAGNETITE NANOPARTICLES Fe3O4@SiO2 Composite NANOPARTICLES Dispersion Thermal Stability Particle Size Magnetic Property
• 年，卷（期）: 2011,（2）
• 页码范围: 49-54
• 页数: 6页
• 分类号: O6

摘要

The Fe3O4@SiO2 composite nanoparticles were obtained from as-synthesized magnetite (Fe3O4) nanoparticles through the modified St?ber method. Then, the Fe3O4 nanoparticles and Fe3O4@SiO2 composite nanoparticles were characterized by means of X-ray diffraction (XRD), Raman spectra, scanning electron microscope (SEM) and vibrating sample magnetometer (VSM). Recently, the studies focus on how to improve the dispersion of composite particle and achieve good magnetic performance. Hence effects of the volume ratio of tetraethyl orthosilicate (TEOS) and magnetite colloid on the structural, morphological and magnetic properties of the composite nanoparticles were systematically investi-gated. The results revealed that the Fe3O4@SiO2 had better thermal stability and dispersion than the magnetite nanoparticles. Furthermore, the particle size and magnetic property of the Fe3O4@SiO2 composite nanoparticles can be adjusted by changing the volume ratio of TEOS and magnetite colloid.