Yin Song, Zhang Tiantian, Yu Yinfeng, Bu Xiaotong, Zhang Zepeng, Geng Junming, Dong Xueling, Jiang Haibing
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Xueyuan Road, Haidian District, Beijing 100083, China.
School of Science, China University of Geosciences, Xueyuan Road, Haidian District, Beijing 100083, China.
Materials (Basel). 2023 Jan 4;16(2):476. doi: 10.3390/ma16020476.
In this work, graphene oxide@Fe3O4 (GO@Fe3O4) two-dimensional magnetically oriented nanocomposites were prepared through the co-precipitation approach using graphene oxide as the carrier and FeCl3·6H2O and FeSO4·7H2O as iron sources. The samples were characterized and tested by X-ray diffraction, a transmission electron microscope, Fourier-transform infrared spectroscopy, a vibrating-specimen magnetometer, a polarized optical microscope, an optical microscope, etc. The effects of material ratios and reaction conditions on the coating effects of Fe3O4 on the GO surface were investigated. The stable GO@Fe3O4 sol system was studied and constructed, and the optical properties of the GO@Fe3O4 sol were revealed. The results demonstrated the GO@Fe3O4 two-dimensional nanocomposites uniformly coated with Fe3O4 nanoparticles were successfully prepared. The GO@Fe3O4 two-dimensional nanocomposites exhibited superparamagnetic properties at room temperature, whose coercive force was 0. The stable GO@Fe3O4 sol system could be obtained by maintaining 1 < pH < 1.5. The GO@Fe3O4 sol showed magneto-orientation properties, liquid crystalline properties, and photonic crystal properties under the influence of the external magnetic field. The strength and direction of the magnetic field and the solid content of the GO@ Fe3O4 sol could regulate the aforementioned properties. The results suggest that GO@Fe3O4 two-dimensional magnetically oriented nanocomposites have potential applications in photonic switches, gas barriers, and display devices.
在本工作中，以氧化石墨烯为载体，FeCl₃·6H₂O和FeSO₄·7H₂O为铁源，通过共沉淀法制备了氧化石墨烯@Fe₃O₄（GO@Fe₃O₄）二维磁取向纳米复合材料。采用X射线衍射、透射电子显微镜、傅里叶变换红外光谱、振动样品磁强计、偏光光学显微镜、光学显微镜等对样品进行了表征和测试。研究了物料比和反应条件对Fe₃O₄在GO表面包覆效果的影响。研究并构建了稳定的GO@Fe₃O₄溶胶体系，揭示了GO@Fe₃O₄溶胶的光学性质。结果表明，成功制备了均匀包覆Fe₃O₄纳米颗粒的GO@Fe₃O₄二维纳米复合材料。GO@Fe₃O₄二维纳米复合材料在室温下表现出超顺磁性，其矫顽力为0。通过保持1＜pH＜1.5可获得稳定的GO@Fe₃O₄溶胶体系。在外部磁场的影响下，GO@Fe₃O₄溶胶表现出磁取向性质、液晶性质和光子晶体性质。磁场的强度和方向以及GO@Fe₃O₄溶胶的固含量可以调节上述性质。结果表明，GO@Fe₃O₄二维磁取向纳米复合材料在光子开关、气体阻隔和显示器件等方面具有潜在应用。
