文档介绍：南京航空航天大学
硕士学位论文
包覆型金属纳米软磁颗粒的制备及性能表征
姓名:王鑫
申请学位级别:硕士
专业:应用化学
指导教师:姬广斌
2011-03
南京航空航天大学硕士学位论文
摘要
包覆型金属纳米软磁材料不仅具有饱和磁感应强度高,磁导率高,矫顽力小等优点,还具
有电阻率大,不易被氧化等优点,是一种理想的软磁材料,具有广泛的应用前景。本文采用不
同的方法制备包覆型金属纳米软磁颗粒,并通过 XRD、SEM、TEM、TG-DTA、VSM 等测试
对合成样品的形貌、结构、性质等进行分析。
将金属醋酸盐溶液与可溶性淀粉均匀混合,蒸发、烘干后在 N2 保护下热处理,得到金属纳
米复合粒子(******@C,******@Co,******@C,******@C,******@C,******@C)。TEM 结果表明金属粒子均匀分
散在碳介质中,粒径为 3~5 nm。样品在室温下具有良好的抗氧化性、热稳定性和软磁性能。
采用溶剂热法制备了有机物包裹的 Co 微纳米金属软磁颗粒;合成的颗粒呈球状,粒径均
匀,为 5 μm 左右;能够耐 450 ℃的温度,热稳定性好;饱和磁感应强度高达 300 emu/g,矫顽
力低至 50 Oe,剩磁在 10 emu/g 以内,软磁性能良好。
同时,本文还证明了实验条件如:表面活性剂用量、溶剂种类、反应温度、反应时间、添
加剂用量、金属盐用量等均对样品的合成及性能具有影响。另外,我们同时合成了有机物包裹
Ni、CoNi 金属颗粒的样品,证明我们的试验方法具有广泛的适用性。
关键词:软磁性能,绿色合成,溶胶-凝胶法,溶剂热法,热稳定性
I
包覆型金属纳米软磁颗粒的制备及性能表征
ABSTRCT
Coated metallic soft-ic nano-material is a typical kind of ideal soft-ic material
with great application prospect because of its advantages such like high saturation induction density
/ic conductivity, low coercivity as well as high resistivity and anti-oxidation property.
In the current thesis, two methods have been adopted to prepare coated metallic soft-ic
particles. Then the morphology, structure and property of as-prepared samples have been investigated
by means of X-ray diffraction(XRD)、transmission electron microscopy(TEM)、scanning electron
microscope(SEM)、Thermo-Gravimetric-Differential Thermal Analyzer(TG-DTA) and vibrating
sample ometer(VSM).A route for the “green” synthesis of carbon-coated metallic
nanoparticles with soft ism by using soluble starch, metallic acetate as the raw materials is
presented at first. The final products can be obtained via evaporating the mixture of aqueous solutions
then annealing under the nitrogen flow. The characterization results clearly show that the
carbon-protected metallic nanoparticles (******@C,******@C,******@C,******@C,******@C,******@C) can be
essfully synthesized and the particles prepared were well dispersed with the average particle
diameter of 3~5 nm. The as-synthesized sa