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Abstract
Highlights
Microwave absorber with nanoscale gradient structure was proposed for enhancing the electromagnetic absorption performance.
Outstanding reflection loss value (−62.7 dB), broadband wave absorption (6.4 dB with only 2.1 mm thickness) in combination with flexible adjustment abilities were acquired, which is superior to other relative graded distribution structures.
This strategy initiates a new method for designing and controlling wave absorber with excellent impedance matching property in practical applications.
In the present paper, a microwave absorber with nanoscale gradient structure was proposed for enhancing the electromagnetic absorption performance. The inorganic–organic competitive coating strategy was employed, which can effectively adjust the thermodynamic and kinetic reactions of iron ions during the solvothermal process. As a result, Fe nanoparticles can be gradually decreased from the inner side to the surface across the hollow carbon shell. The results reveal that it offers an outstanding reflection loss value in combination with broadband wave absorption and flexible adjustment ability, which is superior to other relative graded distribution structures and satisfied with the requirements of lightweight equipment. In addition, this work elucidates the intrinsic microwave regulation mechanism of the multiscale hybrid electromagnetic wave absorber. The excellent impedance matching and moderate dielectric parameters are exhibited to be the dominative factors for the promotion of microwave absorption performance of the optimized materials. This strategy to prepare gradient-distributed microwave absorbing materials initiates a new way for designing and fabricating wave absorber with excellent impedance matching property in practical applications.
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1 Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Advanced Materials Division, Suzhou, People’s Republic of China (GRID:grid.458499.d) (ISNI:0000 0004 1806 6323)
2 Nanchang Institute of Technology, School of Science, Nanchang, People’s Republic of China (GRID:grid.410729.9) (ISNI:0000 0004 1759 3199); Jiangxi Institute of Nanotechnology, Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials, Nanchang, People’s Republic of China (GRID:grid.410729.9)
3 Nanchang Institute of Technology, School of Science, Nanchang, People’s Republic of China (GRID:grid.410729.9) (ISNI:0000 0004 1759 3199)
4 Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Advanced Materials Division, Suzhou, People’s Republic of China (GRID:grid.458499.d) (ISNI:0000 0004 1806 6323); University of Science and Technology of China, School of Nano-Tech and Nano-Bionics, Hefei, People’s Republic of China (GRID:grid.59053.3a) (ISNI:0000000121679639)
5 Nanyang Technological University, School of Materials Science and Engineering, Singapore, Singapore (GRID:grid.59025.3b) (ISNI:0000 0001 2224 0361)
6 Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Advanced Materials Division, Suzhou, People’s Republic of China (GRID:grid.458499.d) (ISNI:0000 0004 1806 6323); Jiangxi Institute of Nanotechnology, Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials, Nanchang, People’s Republic of China (GRID:grid.458499.d); University of Science and Technology of China, School of Nano-Tech and Nano-Bionics, Hefei, People’s Republic of China (GRID:grid.59053.3a) (ISNI:0000000121679639)
7 Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Advanced Materials Division, Suzhou, People’s Republic of China (GRID:grid.458499.d) (ISNI:0000 0004 1806 6323); Xi’an University of Science and Technology, College of Safety Science and Engineering, Xi’an, People’s Republic of China (GRID:grid.440720.5) (ISNI:0000 0004 1759 0801)
8 Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Advanced Materials Division, Suzhou, People’s Republic of China (GRID:grid.458499.d) (ISNI:0000 0004 1806 6323); Jiangxi Institute of Nanotechnology, Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials, Nanchang, People’s Republic of China (GRID:grid.458499.d)
9 Suzhou University of Science and Technology, Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou, People’s Republic of China (GRID:grid.440652.1) (ISNI:0000 0004 0604 9016)
10 Jiangxi Institute of Nanotechnology, Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials, Nanchang, People’s Republic of China (GRID:grid.440652.1)
11 Nanjing Tech University, School of Mechanical and Power Engineering, Nanjing, People’s Republic of China (GRID:grid.412022.7) (ISNI:0000 0000 9389 5210)
12 Henan Polytechnic University, Henan Key Laboratory of Materials On Deep-Earth Engineering, School of Materials Science and Engineering, Jiaozuo, People’s Republic of China (GRID:grid.412097.9) (ISNI:0000 0000 8645 6375)