Electromagnetic absorption properties of Ni0.6Zn0.4Fe2O4/rGO composites and their modified coatings
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摘要: 随着5G时代的到来，各类电子设备的广泛使用随之导致了严重的电磁污染问题，迫切需要开发高性能的电磁吸波材料来解决上述问题。本文采用简单的原位生长法在还原氧化石墨烯(rGO)片层上生长了镍锌铁氧体(Ni0.6Zn0.4Fe2O4)纳米粒子，通过控制rGO的掺量制备了一系列的Ni0.6Zn0.4Fe2O4/rGO (NZFO/rGO)吸波剂，NZFO/rGO-1:0.5在11.24 GHz时的最小反射损耗(RL)值为−60.72 dB，匹配厚度为2.98 mm。此外，制备的NZFO/rGO/环氧树脂吸波涂层在NZFO/rGO-1:0.5复合材料掺量为5 wt%时，涂覆在水泥基平板上的最小RL值为−42.2 dB，比纯环氧树脂涂层的最小RL值降低了90.95%；当掺量为3wt%时，有效吸收带宽(EAB)为8.88 GHz，RL值小于−5 dB时吸收带宽可达13.2 GHz。
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关键词:
- Ni0.6Zn0.4Fe2O4 /
- 匹配厚度 /
- 反射损耗 /
- 环氧树脂 /
- 吸波涂层
Abstract: With the advent of the 5G era, the widespread use of various electronic devices has led to serious electromagnetic pollution problems. It is urgent to develop high-performance electromagnetic wave absorption materials to solve the above problems. In our work, nickel zinc ferrite (Ni0.6Zn0.4Fe2O4) nanoparticles were grown on reduced graphene oxide (rGO) sheets by a simple in situ growth method, and a series of Ni0.6Zn0.4Fe2O4/rGO (NZFO/rGO) absorbers were prepared by adjusting the dosage of rGO. The minimum reflection loss (RL) of NZFO/rGO-1:0.5 at 11.24 GHz is −60.72 dB with the matching thickness of 2.98 mm. In addition, when 5 wt% NZFO/rGO-1:0.5 composites were used to prepare the modified epoxy resin coating, the minimum RL value of the cement-based materials coated the coating is −42.2 dB, which is 90.95% lower than the minimum RL value of pure epoxy resin specimen; When the dosage is 3 wt%, the effective absorption bandwidth (EAB) value is 8.88 GHz, and the absorption bandwidth can reach 13.2 GHz when the RL value is less than −5 dB.-
Key words:
- Ni0.6Zn0.4Fe2O4 /
- matching thickness /
- reflection loss /
- epoxy resin /
- absorption coating
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图 1 镍锌铁氧体(Ni0.6Zn0.4Fe2O4)和Ni0.6Zn0.4Fe2O4/还原氧化石墨烯(NZFO/rGO)复合材料的XRD图谱
Figure 1. XRD patterns of nickel zinc ferrite (Ni0.6Zn0.4Fe2O4) and Ni0.6Zn0.4Fe2O4/reduced graphene oxide (NZFO/rGO) composites
图 2 (a、e) NZFO，(b、f) NZFO/rGO-1:0.2，(c、g) NZFO/rGO-1:0.5和(d、h) NZFO/rGO-1:1复合材料的SEM图片
Figure 2. SEM images of (a, e) NZFO, (b, f) NZFO/rGO-1:0.2, (c, g) NZFO/rGO-1:0.5, and (d, h) NZFO/rGO-1:1 composites
图 3 所有复合材料的(a)介电常数实部$ {\varepsilon }^{\prime } $，(b)磁导率实部${\mu }^{\prime } $, (c)介电常数虚部$ {\varepsilon }^{\prime\prime } $，(d)磁导率虚部$ {\mu }^{\prime \prime } $， (e)介电损耗正切$ \text{tan}{\delta }_{\mathrm{\varepsilon }} $，(f)磁损耗正切$ \text{tan}{\delta }_{\mathrm{\mu }} $
Figure 3. (a) the real part of complex permittivity $ {\varepsilon }^{\prime }$, (b) the real part of complex permeability ${\mu }^{\prime } $, (c) the imaginary part of complex permittivity $ {\varepsilon }^{\prime\prime }$, (d) the imaginary part of complex permeability $ {\mu }^{\prime\prime }$, (e) the dielectric loss tangent $ \text{tan}{\delta }_{\mathrm{\varepsilon }} $, (f) the magnetic loss tangent $ \text{tan}{\delta }_{\mathrm{\mu }} $ of all composites
图 4 (a) NZFO, (b) NZFO/rGO-1:0.2, (c) NZFO/rGO-1:0.5和(d) NZFO/rGO-1:1复合材料的RL值和三维RL图
Figure 4. The RL values and 3 D RL plots of (a) NZFO, (b) NZFO/rGO-1:0.2, (c) NZFO/rGO-1:0.5, and (d) NZFO/rGO-1:1 composites
图 5 (a) NZFO, (b) NZFO/rGO-1:0.2, (c) NZFO/rGO-1:0.5和(d) NZFO/rGO-1:1复合材料的Cole-Cole曲线
Figure 5. The Cole-Cole curves of (a) NZFO, (b) NZFO/rGO-1:0.2, (c) NZFO/rGO-1:0.5, and (d) NZFO/rGO-1:1 composites
图 6 (a) NZFO/rGO-1:0.5复合材料不同厚度与RL值的频率依赖关系以及对应的阻抗匹配，所有NZFO/rGO复合材料的(b)衰减常数和(c)涡流系数
Figure 6. (a) The frequency dependence of RL values for the NZFO/rGO-1:0.5 composite with different thicknesses and the corresponding impedance matching; (b) the attenuation constant and (c) the eddy current loss of all NZFO/ /rGO composites
图 7 NZFO/rGO复合材料可能的电磁波吸收机制
Figure 7. The possible EMA mechanisms for NZFO/rGO composites
图 8 不同改性环氧树脂涂层的水泥基板的(a)反射率和(b)有效吸收带宽
Figure 8. The (a) reflectivity and (b) EAB of the cement-based with different modified epoxy resin coatings
表 1 普通硅酸盐水泥(P.O.42.5 R)的化学成分 (wt%)
Table 1. Chemical composition of ordinary Portland cement (P.O.42.5 R) (wt%)
CaO SiO2 Al2O3 Fe3O4 MgO SO3 K2O P2O5 Na2O other 55.34 19.91 6.92 5.91 5.19 3.21 1.61 1.04 0.12 0.75 
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