期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 176, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2023.107869
关键词
A. Nano-structures; B. Magnetic properties; D. Microstructural analysis; E. Microwave absorption property
Metal-organic framework (MOF) derivatives have been found to be potential microwave absorbing materials (MAMs) due to their high porosity, abundant surface sites, and tunable constituents. This paper proposes an efficient microstructure controllable strategy for synthesizing thin-thickness broadband MAMs called NiFe@C. By controlling the supersaturation of precursors, different microstructures with specific absorption capabilities were obtained. This work provides a facile direction for designing thin thickness MAMs with broadband microwave absorption capability.
Metal-organic framework (MOF) derivatives exhibit great potential as microwave absorbing materials (MAMs) owing to their high porosity, abundant surface sites and tunable constituents. Herein, this paper proposed an efficient microstructure controllable strategy for synthesizing thin-thickness broadband MAMs named NiFe@C by regulating its material microstructure. NiFe-MOF-74 precursors were firstly prepared through solvothermal method. By controlling the supersaturation of precursors, three kinds of microstructures were obtained: 3-dimensional lotus-like nanorods self-assembled structure, 1-dimensional nanospheres/nanorods hybrid structure, and 0-dimensional nanospheres structure. Subsequently, NiFe@C derivatives were obtained by pyrolysis, inheriting the microstructures of NiFe-MOF-74. The lotus-like structure of NiFe@C achieves an effective absorption bandwidth (reflection loss < -10 dB) of 5.09 GHz (12.91-18.00 GHz) with thickness of only 1.6 mm, while the nanospheres structure of NiFe@C exhibits the maximum absorptance of 99.96% at 17.12 GHz with thickness of 2.3 mm. This work provides a facile direction for designing thin thickness MAMs with broadband microwave absorption capability.
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