Sethy Pujashree Priyadarshini, Sundaray Bibekananda
Department of Physics, Ravenshaw University, Cuttack-753003, Odisha, India.
Nanotechnology. 2023 Aug 16;34(44). doi: 10.1088/1361-6528/acebf9.
Co-axially electrospun, magnetic FeO@carbon (FeO@C) nanofibers comprising FeOparticles in the core and carbon in the shell have been fabricated and their performances as magnetic material have been studied. The electrospun FeO@C nanofibers have been characterized with x-ray diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscope, x-ray photoelectron spectroscope (XPS), and superconducting quantum interference device magnetometer. The structural and microstructural analysis has given a brief idea about the pure FeOand C phase formation and also the existence of smooth and continuous morphology of FeO@C nanofibers. It has been shown that there exist two different oxidation states of Fe in the XPS spectrum. The magnetization hysteresis loop has been observed at low temperatures (5 K, 100 K) as well as at room temperature (300 K) which gives different magnetic parameters. Temperature dependent magnetic measurements (from 5 to 300 K) suggest the existence of Verwey transition for lower percentage of iron oxide content.
已制备出同轴电纺的磁性FeO@碳（FeO@C）纳米纤维，其核心为FeO颗粒，外壳为碳，并对其作为磁性材料的性能进行了研究。通过X射线衍射、场发射扫描电子显微镜、高分辨率透射电子显微镜、X射线光电子能谱（XPS）和超导量子干涉仪磁力计对电纺FeO@C纳米纤维进行了表征。结构和微观结构分析对纯FeO和C相的形成以及FeO@C纳米纤维光滑连续形态的存在有了一个简要的认识。结果表明，在XPS光谱中存在两种不同氧化态的Fe。在低温（5 K、100 K）以及室温（300 K）下均观察到了磁化滞后回线，其给出了不同的磁性参数。温度相关的磁性测量（从5到3 K）表明，对于较低百分比的氧化铁含量，存在韦尔维转变。
