The effects of temperature, contact time, and molar ratio of HCl:KMnO4 on the morphology of FeNi3/MnO2 core-shell nanostructure and its application in microwave absorption
Source abstract
Abstract
In this study, we aimed to fabricate FeNi 3@MnO 2 core-shell structures using the hydrothermal method for the first time and investigated the effect of temperature, time, and molar ratio of HCl: KMnO 4 on the structure, morphology, and absorption of electromagnetic waves. X-ray diffraction analysis showed that the FeNi 3@MnO 2 structure was formed, which was increased by increasing the reaction temperature and time. However, the intensity of FeNi 3 peaks was decreased though the intensity and number of MnO 2 peaks were increased. The morphology was studied using field emission scanning electron microscopy and transmission electron microscopy, which showed that a core-shell structure was formed at 100 °C for 3 h with a molar ratio of 1:1. The hysteresis loops of the samples showed that the value of saturation magnetization is decreased by increasing the temperature, time, and molar ratio. Microwave absorption was investigated in the 2–18 GHz frequency range, which indicated a better reflection loss of −34 dB in GHz with a thickness of 1.5 mm.
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Research context
OpenAlex topics: Electromagnetic wave absorption materials · Advanced Antenna and Metasurface Technologies · Magnetic Properties and Synthesis of Ferrites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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