The structural and third-order nonlinear optical properties of ZnO/Fe₃O₄ nanocomposites synthesized with and without ionic liquid (IL) were investigated. The prepared samples are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and vibrating-sample magnetometer (VSM), respectively. The incorporation of Fe₃O₄ in ZnO was also confirmed by the XRD pattern. Although, according to the literature, SEM images of nanostructures which have been synthesized without IL, illustrated nanoparticle morphology, in the presence of the IL sheet-like morphology has been created in this research. VSM graphs confirmed the sandwich-like formation of ZnO/Fe₃O₄ nanocomposites in which the Fe₃O₄ has been embedded between ZnO layers and produced a sandwich-like structure by IL. It led to decrease saturated magnetization of the sheet-like morphology in comparison with nanoparticle morphology. Third-order nonlinear optical properties of ZnO/Fe₃O₄ nanocomposites have been investigated by the Z-scan technique. The nonlinearity responses of the nanocomposites have been studied during the different incident intensity of the laser. The higher incident intensity led to the higher nonlinearity response of the ZnO/Fe₃O₄ nanoparticle composites in comparison with ZnO/Fe₃O₄ sheet-like morphology. Experimental results reveal that the ZnO/Fe₃O₄ nanocomposites both nanoparticles and sheet-like morphology, exhibit two-photon absorption (TPA) and self-defocusing nature.

研究了有和没有离子液体（IL）合成的ZnO / Fe ₃ O ₄纳米复合材料的结构和三阶非线性光学性质。分别通过X射线衍射（XRD），扫描电子显微镜（SEM），傅里叶变换红外（FTIR）光谱和振动样品磁力计（VSM）对制备的样品进行研究。XRD图谱也证实了Fe ₃ O ₄在ZnO中的结合。尽管根据文献，已经在没有IL的情况下合成了纳米结构的SEM图像说明了纳米颗粒的形态，但是在该研究中已经创建了具有IL片状形态的纳米结构。VSM图证实了ZnO / Fe ₃的三明治状形成Fe ₄ O ₄嵌入在ZnO层之间并通过IL产生三明治状结构的O ₄纳米复合材料。与纳米颗粒形态相比，这导致片状形态的饱和磁化强度降低。通过Z扫描技术研究了ZnO / Fe ₃ O ₄纳米复合材料的三阶非线性光学性质。研究了纳米复合材料在激光不同入射强度下的非线性响应。较高的入射强度导致的ZnO / Fe的较高非线性响应₃ ö ₄与比较的ZnO纳米粒子的复合材料/ Fe的₃ ö ₄片状形态。实验结果表明，ZnO / Fe ₃ O ₄纳米复合材料既具有纳米颗粒又具有片状形态，具有双光子吸收（TPA）和自散焦特性。