磁铁矿基核壳纳米颗粒中氧K边缘精细结构与钴/镍含量的关系

IF 2.2 3区工程技术 Q1 MICROSCOPY

Micron Pub Date : 2025-05-22 DOI:10.1016/j.micron.2025.103858

Simon Hettler , Raul Arenal

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引用次数: 0

摘要

氧化铁纳米颗粒（NPs）有着广泛的应用，并提供了通过形成混合核壳结构来微调其性能的可能性。扫描透射电子显微镜（STEM）和电子能量损失谱（EELS）在局部尺度上经常被用来研究这些NPs。特别是，能量损失近边结构（ELNES）提供了丰富的局部化学信息。本文利用O-K边缘比能窗的强度比，定量研究了氧K边缘的ELNES信号与钴和镍进入磁铁矿NPs壳之间的依赖关系。分析表明，NP的局部和全局钴和镍含量都会影响这种关系。此外，研究了Fe-L1和Ni-L2,3边缘之间的重叠，讨论了支撑膜对ELNES分析的影响，并证明了清洁样品制备的重要性。

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On the relationship between oxygen K edge fine structure and cobalt/nickel content in magnetite-based core-shell nanoparticles

Iron oxide nanoparticles (NPs) are used in a broad range of applications and offer the possibility of fine tuning their properties by forming hybrid core-shell structures. Scanning transmission electron microscopy (STEM) combined with electron energy loss spectroscopy (EELS) is frequently used to study such NPs at the local scale. Specifically, the energy loss near edge structure (ELNES) provides rich information on the local chemistry. Here, the dependence between the ELNES signal of the oxygen K edge and the incorporation of cobalt and nickel into the shell of magnetite NPs is investigated quantitatively using an intensity ratio between specific energy windows of the O-K edge. The analysis shows that both the local and global cobalt and nickel content of a NP influence this relationship. In addition, the overlap between the Fe-L₁ and Ni-L_2,3 edges is studied, the impact of a supporting film on the ELNES analysis is discussed, and the importance of a clean sample preparation is demonstrated.

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来源期刊

Micron 工程技术-显微镜技术

CiteScore

4.30

自引率

4.20%

发文量

100

审稿时长

31 days

期刊介绍： Micron is an interdisciplinary forum for all work that involves new applications of microscopy or where advanced microscopy plays a central role. The journal will publish on the design, methods, application, practice or theory of microscopy and microanalysis, including reports on optical, electron-beam, X-ray microtomography, and scanning-probe systems. It also aims at the regular publication of review papers, short communications, as well as thematic issues on contemporary developments in microscopy and microanalysis. The journal embraces original research in which microscopy has contributed significantly to knowledge in biology, life science, nanoscience and nanotechnology, materials science and engineering.