Atomic?Scale Layer?by?Layer Deposition of FeSiAl@ZnO@Al2O3 Hybrid with Threshold Anti?Corrosion and Ultra?High Microwave Absorption Properties in Low?Frequency Bands

• 作者: Wei Tian Jinyao Li Yifan Liu Rashad Ali Yang Guo Longjiang Deng Nasir Mahmood Xian Jian
• 来源期刊: 纳微快报（英文版）
• 年，卷（期）: 2021,（10）
• 页码范围: 308-321
• 页数: 14页
• 语种: 英文

摘要

Developing highly efficient magnetic microwave absorbers (MAs) is crucial, and yet challenging for anti-corrosion properties in extremely humid and salt-induced foggy environments. Herein, a dual-oxide shell of ZnO/Al2O3 as a robust barrier to FeSiAl core is introduced to mitigate corrosion resistance. The FeSiAl@ZnO@Al2O3 layer by layer hybrid structure is realized with atomic-scale precision through the atomic layer deposition technique. Owing to the unique hybrid structure, the FeSiAl@ZnO@Al2O3 exhibits record-high microwave absorbing performance in low-frequency bands covering L and S bands with a minimum reflection loss -(RLmin) of -50.6 dB at 3.4 GHz. Compared with pure FeSiAl -(RLmin of -13.5 dB, a bandwidth of 0.5 GHz), the -RLmin value and effective bandwidth of this designed novel absorber increased up to ～ 3.7 and ～ 3 times, respectively. Furthermore, the inert ceramic dual-shells have improved 9.0 times the anti-corrosion property of FeSiAl core by multistage barriers towards corrosive medium and obstruction of the electric circuit. This is attributed to the large charge transfer resistance, increased impedance modulus |Z|0.01 Hz, and frequency time constant of FeSiAl@ZnO@Al2O3. The research demonstrates a promising platform toward the design of next-generation MAs with improved anti-corrosion properties.