三维自组装Eu3+-石墨烯复合材料的制备及其磁性研究

采用一锅水热法在180 ℃ 下制备三维Eu³⁺-石墨烯自组装复合材料. 通过X射线衍射、 扫描电子显微镜、透射电子显微镜表征了合成样品的物相及形貌特征. 结果表明: 合成的样品具有多孔性结构, 层与层之间堆叠成三维结构, 并且结果显示产物中没有Eu³⁺的团聚体. 经过拉曼光谱, 傅里叶红外光谱分析表明, Eu³⁺通过含氧官能团与石墨烯复合. 通过振动样品磁强计测定样品的磁滞回线, 对其磁学性能进行研究, 剥离顺磁信号后, 测得相应的矫顽力H_c ≈ 39.61 Oe(1 Oe=79.5775 A/m), 饱和磁化强度M_s ≈ 0.08 emu/g, 发现该产物具有弱的铁磁性, 与石墨烯相比, Eu³⁺的加入使得产物的铁磁性有较大提高. 关键词： 三维石墨烯 3+')" href="#">Eu³⁺ 水热法 磁性

Synthesis and magnetic properties of three-dimensional self-assembly Eu3+-graphene composite material

The three-dimensional self-assembly Eu³⁺-graphene composite materials are synthesized through a one-pot hydrothermal reaction under 180 ℃. The obtained samples are analyzed through powder X-ray diffraction, scanning electron microscope, and transmission electron microscopy. The results show that each sample has porous structure and no independent Eu³⁺ agglomerates. Raman spectrum and Fourier transform infrared spectrum analyses indicate Eu³⁺ is well complexed with graphene through oxygen-containing groups. The magnetic properties are measured using vibrating sample magnetometer. The magnetic hysteresis loop shows the corresponding coercivity H_c ≈ 39.61 Oe (1 Oe=79.5775 A/m) and the magnetization saturation M_s ≈ 0.08 emu/g that indicates that the sample presents weak ferromagnetism and good soft magnetic properties compared with graphene.
Keywords： three-dimensional graphene 3+')" href="#">Eu³⁺ hydrothermal method magnetic properties