Ni-RGO纳米吸波材料的制备及其电磁行为研究

采用化学镀的方法在还原氧化石墨烯(RGO)表面均匀沉积金属镍纳米颗粒, 通过调节镍前驱体浓度获得三种不同镍含量的Ni-RGO新型电磁吸波材料。通过透射电镜和X射线衍射分析对Ni-RGO的表面形态及晶体结构进行了研究, 电磁参数测试结果显示Ni-RGO的介电常数达8以上, 比氧化石墨烯提高近三倍; 反射率计算结果表明镍前驱体浓度最低的Ni-RGO-1的电磁吸波性能最佳, 当厚度为2 mm时, 其最大反射率可达-24.5 dB。

Preparation and Electromagnetic Absorption Performance of Ni-RGO

Electroless plating was utilized to deposit nickel nanoparticles on the reduced graphene oxide (RGO). By adjusting the nickel salt precursor concentration, three kinds of Ni-RGO with different nickel contents were synthesized, namely Ni-RGO-1, Ni-RGO-2 and Ni-RGO-5. Transmission electron microscopy and X-ray diffraction were employed to study the surface morphology and crystal structure of as-prepared Ni-RGO. The electromagnetic performance of graphene oxide and Ni-RGO was characterized. The results indicated that the permittivity of Ni-RGO was above 8, almost three times higher than that of pristine graphene oxide. Ni-RGO-1 exhibited the best electromagnetic wave absorption performance, although the concentration of nickel precursor is the lowest one among three samples. The minimal reflection loss was up to -24.5 dB for Ni-RGO-1 with a thickness of 2 mm.