With the fast development of electronic technique, abundant microwave radiation and interference affect the human’s health deeply. Here, a novel low-frequency microwave absorbent of TiO₂/ZnFe₂O₄/ZnTiO₃ nanocomposite was prepared via a combinative route of sol–gel, solvothermal and calcination. The electromagnetic wave-absorbing properties of this ternary nanocomposite are closely related to the pre-treated concentration of TiO₂ with nitric acid. The suitable concentration can promote the final absorption performance due to the increasing surface groups and defects for enhanced dipole polarization. The interface polarization between anatase and rutile TiO₂ also contributes a lot to the absorption effect. Additionally, the natural resonance, eddy current, multiple scattering and good impedance match play a significant effect as well. Thus, the excellent microwave-absorbing ability of as-prepared composite generates from the synergy effectiveness of magnetic and dielectric losses. The optimal reflection loss reaches −45.3 dB at 1.19 GHz with EAB of 0.82 ~ 1.67 GHz for 3.5 mm, and the widest efficient absorbing bandwidth achieves 1.5 GHz at only 1.5 mm. The investigation reported here provides a novel route to adjust the microwave absorption capability of TiO₂-based MAMs in low-frequency band.

随着电子技术的飞速发展，大量的微波辐射和干扰对人体健康产生了深远的影响。在这里，通过溶胶-凝胶，溶剂热和煅烧的组合路线制备了一种新型的TiO ₂ / ZnFe ₂ O ₄ / ZnTiO ₃纳米复合材料低频微波吸收剂。该三元纳米复合材料的电磁波吸收特性与硝酸对TiO ₂的预处理浓度密切相关。由于增加的表面基团和增强的偶极极化缺陷，合适的浓度可以促进最终吸收性能。锐钛矿与金红石型TiO ₂之间的界面极化也对吸收效果有很大贡献。另外，自然共振，涡流，多重散射和良好的阻抗匹配也起着重要的作用。因此，制备的复合材料具有优异的微波吸收能力，这是由磁损耗和介电损耗的协同效应产生的。最佳反射损耗在1.19 GHz时达到-45.3 dB，对于3.5 mm的EAB为0.82〜1.67 GHz，最宽的有效吸收带宽在1.5 mm时达到1.5 GHz。本文报道的研究提供了一种新颖的途径来调节基于TiO ₂的MAM在低频带中的微波吸收能力。