Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5B, 02-106 Warsaw, Poland.
Advanced Imaging and Microscopy Laboratory, Maryland Nano Center, University of Maryland, College Park, MD, 20742-2831, United States of America.
Nanotechnology. 2023 May 24;34(32). doi: 10.1088/1361-6528/acd38a.
The zerovalent iron (Fe) nanomaterials tend to be spontaneously oxidized in the presence of oxygen. This leads to the formation of interface composed of iron core and thin iron oxide shell. These structures are frequently observed with transmission electron microscope but, at the same time, it is hard to determine the precise structural and chemical composition of oxide shell. This feature is very important for possible applications of Fenanostructures. Hence, the present work aims to deliver more detailed insights in this topic. The investigations are performed for the iron nanochains prepared in the magnetic-field-induce reduction of FeClby NaBH. The high-resolution transmission electron microscopy, electron energy loss spectroscopy, and x-ray photoemission spectroscopy confirm that the iron nanochains are covered by very thin oxide layer not exceeding over 3 nm. Moreover, the detailed XPS analyses of O 1s and Fe 2p lines indicate that the iron oxide shell reveals FeOnature. Moreover, this work demonstrated that some by-products of the reaction containing boron are presented in the sample even after a removal of the thin iron oxide shell by Artreatment.
零价铁（Fe）纳米材料在氧气存在下容易自发氧化。这导致形成由铁核和薄氧化铁壳组成的界面。这些结构经常用透射电子显微镜观察到，但同时，很难确定氧化物壳的精确结构和化学组成。对于 Fenanostructures 的可能应用，这一特性非常重要。因此，目前的工作旨在对此主题进行更详细的研究。该研究针对在磁场诱导下由 NaBH 还原 FeCl 制备的铁纳米链进行。高分辨率透射电子显微镜、电子能量损失光谱和 X 射线光电子能谱证实，铁纳米链被非常薄的氧化层覆盖，不超过 3nm。此外，O 1s 和 Fe 2p 线的详细 XPS 分析表明，氧化铁壳呈现 FeOnature。此外，这项工作表明，即使通过 Ar 处理去除了薄的氧化铁壳，样品中仍存在含有硼的反应副产物。
