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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Controlled Oxidation and Self-Passivation of Bimetallic Magnetic FeCr and FeMn Aerosol Nanoparticles
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Controlled Oxidation and Self-Passivation of Bimetallic Magnetic FeCr and FeMn Aerosol Nanoparticles

机译：双金属磁性FECR和FEMN气溶胶纳米粒子的受控氧化和自钝化

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Nanoparticle generation by aerosol methods, particularly spark ablation, has high potential for creating new material combinations with tailored magnetic properties. By combining elements into complex alloyed nanoparticles and controlling their size and structure, different magnetic properties can be obtained. In combination with controlled deposition, to ensure nanoparticle separation, it is possible to minimize interparticle interactions and measure the intrinsic magnetic property of the nanoparticles. Most magnetic materials are highly sensitive to oxygen, and it is therefore crucial to both understand and control the oxidation of magnetic nanoparticles. In this study, we have successfully generated oxidized, bimetallic FeCr and FeMn nanoparticles by spark ablation in combination with a compaction step and thoroughly characterized individual particles with aerosol instruments, transmission electron microscopy and synchrotron-based X-ray photoelectron spectroscopy. The generated nanoparticles had an almost identical transition-metal ratio to the electrodes used as seed materials. Further, we demonstrate how the carrier gas can be used to dictate the oxidation and how to alternate between self-passivated and entirely oxidized nanoparticles. We also discuss the complexity of compacting alloyed nanoparticles consisting of elements with different vapor pressures and how this will affect the composition. This knowledge will further the understanding of design and generation of complex alloyed nanoparticles based on transition metals using aerosol methods, especially for the size regime where a compaction step is needed. As a proof of concept, measurements using a magnetometer equipped with a superconducting quantum interference device were performed on samples with different particle coverages. These measurements show that the magnetic properties could be explored for both high and low surface coverages, which open a way for studies where interparticle interactions can be systematically controlled.
机译：纳米颗粒生成通过气溶胶方法，特别是火花烧蚀，具有用于产生具有定制的磁性质的新材料组合高电位。通过元素组合成复杂的合金纳米颗粒和控制它们的大小和结构，可以得到不同的磁特性。在具有受控沉积组合，以确保纳米粒子的分离，它可能最小化间相互作用并且测量纳米颗粒的固有的磁特性。最磁性材料对氧高度敏感，并且这两个理解和控制磁性纳米颗粒的氧化是至关重要的。在这项研究中，我们已经成功地产生由火花烧蚀氧化，双金属铬铁和锰铁纳米颗粒结合有压实步骤和单个颗粒彻底表征气雾剂仪器，透射电子显微术和基于同步加速器的X射线光电子能谱法。所产生的纳米颗粒具有几乎相同的过渡金属比为用作籽晶材料的电极。此外，我们证明，载气可如何用于指示氧化和如何自钝化和完全氧化的纳米颗粒之间的交替。我们还讨论了压实由具有不同蒸汽压力和这将如何影响组合元素的合金纳米粒子的复杂性。这方面的知识将进一步基于使用气雾剂的方法，特别适用于其中需要压实步骤大小政权过渡金属配合物形成合金纳米颗粒的设计和生成的理解。作为概念验证，使用装备有超导量子干涉器件的磁力计测量上具有不同颗粒覆盖范围的样品进行的。这些测量结果表明，磁学性质，可以探索高和低表面覆盖度，这对于开在那里学习间相互作用可以被系统控制的方式。

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