ABSTRACT

In this work, iron oxide (Fe₃O₄) nanosheets are synthesised using the solvothermal method. Transmission electron microscope (TEM) observation confirms the nanosheets-like morphology of Fe₃O_4. While X-ray diffraction (XRD) studies of Fe₃O₄ nanosheets reveal the Fe₃O₄ nanosheets synthesised are crystalline in nature. Vibration sample magnetometry studies of Fe₃O₄ nanosheets have shown superparamagnetic behaviour with saturation magnetisation (M_s) value of 29.6 emu/g. The synthesised Fe₃O₄ nanosheets are dispersed in poly(vinylidene fluoride) PVDF matrix using the solution casting method with slow evaporation of solvent at 60 °C which facilitates the formation of β-form of PVDF crystals. The PVP modified Fe₃O₄ nanosheets incorporation in the PVDF matrix influences the thermal stability and crystalline behaviour. Scanning electron microscope observation shows the improved dispersion of Fe₃O₄ nanosheets in the PVDF matrix by modifying Fe₃O₄ nanosheets with PVP. The M_s value is increased by ∼122% for PVP modified Fe₃O₄ nanosheets reinforced PVDF nanocomposites as compared to Fe₃O₄ nanosheets reinforced PVDF nanocomposites.

摘要

在这项工作中，氧化铁（Fe ₃ O ₄）纳米片是使用溶剂热法合成的。_{透射电子显微镜 (TEM) 观察证实了 Fe 3} O ₄的纳米片状形态。而对 Fe ₃ O ₄纳米片的X 射线衍射 (XRD) 研究表明，合成的 Fe ₃ O ₄纳米片本质上是结晶的。_{Fe 3} O ₄纳米片的振动样品磁力测量研究显示了超顺磁性行为，饱和磁化强度 ( M _s ) 值为 29.6 emu/g。合成的 Fe ₃ O ₄使用溶液浇铸法将纳米片分散在聚（偏二氟乙烯）PVDF基体中，在60°C下缓慢蒸发溶剂，这有助于形成β-型PVDF晶体。掺入 PVDF 基体中的 PVP 改性 Fe ₃ O ₄纳米片会影响热稳定性和结晶行为。扫描电子显微镜观察表明，通过用 PVP改性 Fe ₃ O _{4纳米片，改善了 Fe 3} O ₄纳米片在 PVDF 基体中的分散性。与 Fe 相比，PVP 改性的 Fe ₃ O ₄纳米片增强的 PVDF 纳米复合材料的M _s值增加了 ∼122%₃ O ₄纳米片增强PVDF纳米复合材料。