Synthesis and Characterization of Hybrid Transition Metal/Iron Nanowires
| Autor: | Xu-Xiang Cai, 蔡旭翔 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 The purpose of this study is to synthesize nickel or copper into iron nanowires with high saturation magnetization and low coercively. Nickel and copper are relatively stable in the transition metals and can easy form alloy or solid solution with iron. It will stabilize the iron to resist the oxidation. Therefore, this work study the formation of Ni, Cu, and Fe alloy or solid solution formed in nanowires synthesis, and compares the structure, composition, type, and the properties of electromagnetic inference of these nanowires. By using XRD and TEM analysis to confirm the structure of the synthesized nanowires. VSM results indicate the Cu series iron nanowires have lower coercivity (192.5〜316.1 Oe) than that of Ni series. Cu:Fe NW with 1wt% Cu has the best saturated magnetization of 146.4 emu/g. XAS results reveal both Fe2+ and Fe3+ exist in iron nanowires and according to the L-edge analysis, the iron oxide is magnetite. The analyzed R-space shows the bond length of Fe-O about 1.4-1.6 Å consistent with TEM diffraction result. The EMI results show nickel series nanowires have the better EMI properties than that of copper series nanowires. When these samples application in absorbing the radar waves, Ni/Fe NWs (50:50) have the best benefit, which composited with 95% epoxy and it membrane thickness was in 3mm. The reflection loss was high to -21dB |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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