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Effect of nitric acid treatment on the final low-frequency microwave absorption performance of TiO 2 /ZnFe 2 O 4 /ZnTiO 3 nanocomposite
Applied Nanoscience Pub Date : 2021-01-03 , DOI: 10.1007/s13204-020-01639-w
Pengfei Yin , Yuting Tang , Limin Zhang , Jian Wang , Xing Feng , Jianwu Dai

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.



中文翻译:

硝酸处理对TiO 2 / ZnFe 2 O 4 / ZnTiO 3纳米复合材料最终低频微波吸收性能的影响

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。

更新日期:2021-01-03
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