基于油酸的溶剂热合成可调节磁性的CoFe <sub>2</sub> O <sub>4</sub>纳米粒子的粒径，形态和化学组成控制，用于电子设备,ACS Applied Nano Materials

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基于油酸的溶剂热合成可调节磁性的CoFe ₂ O ₄纳米粒子的粒径，形态和化学组成控制，用于电子设备
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2019-03-28 , DOI: 10.1021/acsanm.8b02009
Sumayya M. Ansari ₁ , Bhavesh B. Sinha ₂ , Deodatta Phase ₃ , Debasis Sen _{4,

5} , Pulya U. Sastry _{4,

5} , Yesh D. Kolekar ₁ , Chintalapalle V. Ramana ₆

Affiliation

我们报告了粒径，形态和化学成分控制的钴铁氧体纳米粒子（CFO NPs）的实现，这些粒子具有可调的磁性，可用于电子和电磁设备。使用基于油酸（OA）的化学合成方法，详细研究了油酸浓度（0.0-0.1 M）对溶剂热合成CFO NPs的结构，物理，化学，电子和磁性的影响。通过控制OA的浓度可以获得晶体，立方和化学均质的CFO NP（5-15 nm）。光谱分析表明，OA分子与CFO NPs形成共价键。通过桥接OA分子和CFO NP之间的双齿相互作用实现了粒径控制。详细的磁测量表明，OA浓度有助于有效控制粒度控制的CFO NP的磁行为。OA分子和CFO表面原子之间的界面导致修饰的磁性，这是了解潜在机理并在实际应用中利用磁性纳米粒子的关键。各向异性常数随纳米颗粒大小的直接变化表明，磁晶组分控制着OA涂层CFO中的磁各向异性。去除OA（热处理后）会导致磁各向异性的增强和表面组分的交换偏向。

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Particle Size, Morphology, and Chemical Composition Controlled CoFe2O4 Nanoparticles with Tunable Magnetic Properties via Oleic Acid Based Solvothermal Synthesis for Application in Electronic Devices

We report on the realization of particle size, morphology, and chemical composition controlled cobalt ferrite nanoparticles (CFO NPs) with tunable magnetic properties for application in electronic and electromagnetic devices. The effect of oleic acid concentration (0.0–0.1 M) on the structural, physical, chemical, electronic, and magnetic properties of solvothermally synthesized CFO NPs is investigated in detail by using the oleic acid (OA) based chemical method for synthesis. Crystalline, cubic, and chemically homogeneous CFO NPs (5–15 nm) can be obtained by controlling the OA concentration. Spectroscopic analyses revealed that the OA molecules form covalent bonds with CFO NPs. The particle-size control was achieved by bridging bidentate interactions between the OA molecules and CFO NPs. Detailed magnetic measurements revealed that the OA concentration helps to effectively control the magnetic behavior of particle-size-controlled CFO NPs. The interfacing between OA molecules and CFO surface atoms leads to modified magnetism which is the key to understand the underlying mechanisms and utilize magnetic nanoparticles in practical applications. The anisotropy constant variation directly with nanoparticle size indicates that the magnetocrystalline component governs the magnetic anisotropy in OA coated CFO. Removal of OA (after thermal treatment) induces enhanced magnetic anisotropy and exchange bias as consequence of surface component. The results and analyses suggest that the molecular coating of nanoparticles offers the most important and critical step to design novel nanostructured magnetic materials for current and emerging electronic device technologies.

更新日期：2019-04-01

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