| 液相热分解纳米铁镍合金的形貌可控合成及其磁学性能研究 | |
| Thermolysis Synthesis of Shape-Controlled Fe-Ni Alloy Nanoparticles and Magnetic Property | |
| 摘要: 以Fe(CO)5和Ni(HCOO)2为前驱物，十八烯为溶剂，在表面活性剂和分散剂油酸和油胺的协同作用下，通过前驱体的液相热分解和自合金化，制备铁镍合金纳米颗粒。通过XRD和TEM研究了产物的微观结构，并对产物的磁学性质进行了表征。结果表明，在反应温度为200 ℃，油胺与油酸及甲酸镍的物质的量比为4∶2∶1，反应时间为20 min时可得形貌可控、抗氧化性强的面心立方晶体结构的平面三角形纳米铁镍合金，晶粒尺寸为15~55 nm。磁性测量表明，300 K时三角形形貌铁镍合金的饱和磁化强度为15.5 emu·g-1，矫顽力趋近于零，呈现超顺磁性；在低温(4.2 K)时，铁镍合金的饱和磁化强度为17.5 emu·g-1，矫顽力增大明显。 | |
| 关键词: 液相法 形貌可控合成 金属纳米颗粒 铁镍合金 磁学性能 | |
| 基金项目: | |
| Abstract: Fe-Ni alloy nanoparticles were synthesized by thermal decomposition of Ni(COOH)2 and Fe(CO)5 with 1-octadecene as the solvent and oleic acid(OA) and oleylamine(OLA) as surfactants. The produced Fe-Ni alloy nanoparticles were characterized by X-ray diffraction(XRD), transmission electron microscope(TEM) and vibrating sample magnetometer(VSM). The results showed that a shape controlled fcc phase Fe-Ni alloy nanoparticles of triangular shape was formed when the molar ratio of OA, OLA and Ni(HCOO)2 was 4∶2∶1 at 200 ℃ fo 20 min. Magnetic measurements revealed the alloy nanoparticles of triangular shape exhibit superparamagnetic behavior with a saturation magnetization of 15.5 emu·g-1 at 300 K; a saturation magnetization of 17.5 emu·g-1 and a coercivity of 158 Oe at 4.2 K. | |
| Keywords: solution method shape control metal nanoparticles Fe-Ni alloy magnetic property | |
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| 赖文忠,王 鹏,赵 威,冷永华,黄 婧,李星国.液相热分解纳米铁镍合金的形貌可控合成及其磁学性能研究[J].无机化学学报,2009,25(10):1703-1710. | |
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