Ni-RGO纳米吸波材料的制备及其电磁行为研究

doi:10.15541/jim20150534

摘要/Abstract

摘要：

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。

关键词: 石墨烯, 纳米镍, 吸波, 谐振, 德拜弛豫

Abstract:

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.

Key words: graphene, nano nickel, wave absorption, resonance, debye relaxation

中图分类号:

TQ174

徐双双, 陈功, 张海琴, 陈元, 肇研. Ni-RGO纳米吸波材料的制备及其电磁行为研究[J]. 无机材料学报, 2016, 31(6): 567-574.

XU Shuang-Shuang, CHEN Gong, ZHANG Hai-Qin, CHEN Yuan, ZHAO Yan. Preparation and Electromagnetic Absorption Performance of Ni-RGO[J]. Journal of Inorganic Materials, 2016, 31(6): 567-574.

图/表 12

图1 Ni-RGO制备过程示意图

Fig. 1 Schematic of synthesis procedure of Ni-RGO

表1 Ni-RGO制备过程各反应物浓度

Table 1 Concentration of reactant for Ni-RGO synthesis

No	NiSO₄	NaH₂PO₂	Na₃C₆H₅O₇
1	0.1 mol/L	0.1 mol/L	0.17 mol/L
2	0.2 mol/L	0.2 mol/L	0.17 mol/L
3	0.5 mol/L	0.5 mol/L	0.17 mol/L

图2 Pd-RGO(a, c)及Ni-RGO-1(b,d)样品的TEM照片

Fig. 2 TEM images of Pd-RGO (a,c) and Ni-RGO-1 (b,d)

图3 Ni-RGO-2(a)及Ni-RGO-5(b)样品的TEM照片

Fig. 3 TEM images of Ni-RGO-2 (a) and Ni-RGO-5 (b)

图4 Pd-RGO和Ni-RGO样品的XRD图谱

Fig. 4 XRD patterns of Pd-RGO and Ni-RGOs

图5 1~18 GHz范围Ni-RGO纳米材料及氧化石墨烯的介电常数及磁导率

Fig. 5 Permittivity and permeability of Ni-RGOs and GO in the frequency range of 1-18 GHz

图6 1~18 GHz范围Ni-RGO介电损耗角及磁损耗角正切

Fig. 6 Dielectric and magnetic loss factor of Ni-RGOs in the frequency range of 1-18 GHz

图7 在2.0 mm厚时, Ni-RGO的反射率-频率曲线

Fig. 7 Reflection loss of Ni-RGOs with thickness of 2.00 mm

图8 Ni-RGO的德拜弛豫模型曲线

Fig. 8 Debye relaxation curves of Ni-RGOs

图9 不同厚度Ni-RGO-1的反射率-频率曲线

Fig. 9 Refleciton loss of Ni-RGO-1 with different thicknesses

图10 Ni-RGO-1的谐振厚度-频率曲线

Fig. 10 Syntonic-thickness curves of Ni-RGO-1

图11 Ni-RGO的阻抗-频率SS曲线

Fig. 11 Impedance of Ni-RGOs

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