Chen Jin, Guo Zhifeng, Tang Yuhang, Zhang Xiaohui
School of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
Phys Chem Chem Phys. 2025 Apr 30;27(17):8960-8975. doi: 10.1039/d5cp00636h.
Different processes are used to design unique microstructures of absorbing materials to meet the requirements of "thin, light, wide and strong" and improve the absorption efficiency of electromagnetic waves. The ZnO@FeO nanomaterial with a unique spindle flower structure was successfully prepared by a hydrothermal method and an annealing process. Then, the ZnO@FeO@RGO composite was obtained by loading the prepared ZnO@FeO nanomaterial on the RGO surface. The crystal structure, morphology, electromagnetic parameters and microwave absorption properties of the synthesized nanocomposites were characterized by changing the amounts of Zn(CHCOO)·2HO and GO, respectively. The wave absorption properties of pure FeO, ZnO@FeO and ZnO@FeO@RGO composites were compared. It was found that the ZnO@FeO@RGO composite exhibits stronger microwave absorption performance. When mixed with paraffin wax at 50 wt%, the thickness of the absorption layer was only 2.5 mm, the reflection loss (RL) at 11.36 GHz reached -57.91 dB, and the effective absorption bandwidth was 4.24 GHz (9.44-13.68 GHz). ZnO@FeO nanocrystals can inhibit the agglomeration of RGO and improve the impedance matching between the heterostructural interface and RGO. Therefore, the composite can be used as an effective microwave absorber.
采用不同工艺设计吸波材料的独特微观结构，以满足“薄、轻、宽、强”的要求并提高电磁波吸收效率。通过水热法和退火工艺成功制备了具有独特纺锤花结构的ZnO@FeO纳米材料。然后，通过将制备的ZnO@FeO纳米材料负载在RGO表面获得ZnO@FeO@RGO复合材料。分别通过改变Zn(CHCOO)·2HO和GO的用量来表征合成的纳米复合材料的晶体结构、形貌、电磁参数和微波吸收性能。比较了纯FeO、ZnO@FeO和ZnO@FeO@RGO复合材料的吸波性能。发现ZnO@FeO@RGO复合材料表现出更强的微波吸收性能。当与石蜡以50 wt%混合时，吸收层厚度仅为2.5 mm，11.36 GHz处的反射损耗（RL）达到-57.91 dB，有效吸收带宽为4.24 GHz（9.44-13.68 GHz）。ZnO@FeO纳米晶体可以抑制RGO的团聚并改善异质结构界面与RGO之间的阻抗匹配。因此，该复合材料可作为一种有效的微波吸收剂。
