摘要
以水热法一步合成的C/ZnO微球为基材,通过煅烧处理得到ZnO中空多孔微球,随后利用尿素均相沉积方法及煅烧处理成功制备了ZnO/Gd_(2)O_(3)复合吸波材料。通过对样品的形貌、组成、磁性能与电磁特性的表征,讨论了调控尿素的加入量对产物吸波性能的影响,同时,探讨了该复合体系的吸波机理。结果显示,将磁性Gd_(2)O_(3)与介电损耗型ZnO相结合设计异质结构,磁损耗的引入能改善阻抗匹配特性。由于双重损耗机制、异质结构和中空多孔结构的协同作用,ZnO/Gd_(2)O_(3)展示了高效的电磁波吸收能力。磁导率和匹配特性随着Gd_(2)O_(3)含量的增加而增大,而高介电常数和衰减特性随着Gd_(2)O_(3)含量的增加而减小。当尿素的加入量为0.5 g时,所得ZnO/Gd_(2)O_(3)-2展示出优良的宽带、高吸收特性,当匹配厚度为3.5 mm时,对应有效吸收带宽为7.08 GHz,其最大吸收为-40.76 dB。
Using the C/ZnO microspheres synthesized by a hydrothermal method as the precursors,the ZnO hollow porous microspheres were obtained by a calcination treatment,and then the ZnO/Gd_(2)O_(3) hollow porous composites were successfully prepared via the urea homogeneous deposition and the calcination treatment.The characterizations of the morphology,composition,magnetic and electromagnetic properties reveal the influence of the wave absorption properties of the urea and the absorption mechanism of the composite system.The results show that the combination of the magnetic Gd_(2)O_(3) with the dielectric loss type ZnO into the heterogeneous structures can improve the impedance matching properties.Owing to the dual loss mechanism,heterostructure,and hollow porous structures,ZnO/Gd_(2)O_(3) exhibits an efficient electromagnetic wave absorption capability.With increasing Gd_(2)O_(3) content,the permeability and matching properties increase,while the dielectric constant and attenuation properties decrease.When the amount of urea is 0.5 g,the as-obtained ZnO/Gd_(2)O_(3)-2 exhibits the best microwave absorption performance and the maximum absorption,effective bandwidth and matching thickness are-40.76 dB,7.08 GHz and 3.5 mm,respectively.
作者
王晶琳
聂志颖
杨怡均
乔儒
童国秀
Wang Jinglin;Nie Zhiying;Yang Yijun;Qiao Ru;Tong Guoxiu(Key Laboratory of Advanced Catalytic Materials of Ministry of Education,College of Chemistry and Life Sciences,Zhejiang Nor-mal University,Jinhua 321004,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2024年第1期70-79,I0003,共11页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(52073260)
浙江师范大学自主设计项目(2020ZS0401,2020ZS0403)资助。
