Magnetic hierarchically porous biomass carbon for realizing broadband and strong absorption of electromagnetic wave |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan''an University, Yan''an, 716000, China;2. MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary, School of Physical Science and Technology, Northwestern Polytechnical University, Xi''an, 10072, China;1. Key Laboratory of Electronic Functional Composite Materials of Guizhou Province, College of Big Data and Information Engineering, Guizhou University, Guiyang, 550025, PR China;2. School of Electronic and Communication Engineering, Guiyang University, Guiyang, 550005, PR China;1. Composites and Nano-Structured Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications, New Borg El-Arab City, P.O: 21934, Alexandria, Egypt;2. Chemistry Department, Faculty of Science, Alexandria University, P.O: 21568, Alexandria, Egypt;1. Photonics Research Centre, Universiti Malaya, 50603, Kuala Lumpur, Malaysia;2. Department of Physics, Faculty of Science, Universiti Malaya, 50603, Kuala Lumpur, Malaysia;3. Universiti Kuala Lumpur British Malaysian Institute (UniKL BMI), Batu 8, Jln Sungai Pusu, 53100, Selangor, Malaysia;4. Materials and Energy Research Center, 31787-316, Karaj, Iran;5. Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya, 60115, Indonesia;1. School of Energy & Environmental Engineering, Hebei Engineering Research Center of Pollution Control in Power System, Tianjin Key Laboratory of Clean Energy and Pollution Control, Hebei University of Technology, Tianjin, 300401, PR China;2. Solid Waste and Chemicals Management Center, Ministry of Ecology and Environment, Beijing, 100029, PR China;3. College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin, 300350, PR China;4. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300401, PR China;1. Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Renmin Street NO. 5988, Changchun, Jilin Province, 130025, PR China;2. School of Mechanical and Aerospace Engineering, Jilin University, Renmin Street NO. 5988, Changchun, Jilin Province, 130025, PR China;3. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, PR China |
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| Abstract: | Hierarchically porous carbon materials provide favorable conditions for electromagnetic wave loss enhancement due to the superimposed positive influence of multilevel pores. However, high production costs and complex preparation limit their large-scale production. Biomass carbon with a natural hierarchically porous structure offers an alternative; however, the impedance mismatch and single-loss mechanism prevent biomass carbon from being an ideal absorbent for broadband and strong absorption. In this study, a series of magnetic hierarchically porous biomass carbons were prepared using a facile adsorption-inert calcination method. The natural hierarchical porous structure of the loofah sponge provides numerous adsorption sites for ferric ions, which are transformed in situ into Fe3O4 during calcination to regulate the conductivity. The impedance matching and electromagnetic loss properties of the biomass carbon/Fe3O4 composites were adjusted by varying the amount of ferric nitrate. Optimal performance occurs when ferric nitrate weighs 0.8 g, and the calcination temperature is 600 °C. Under these conditions, the effective absorption bandwidth reaches 5.28 GHz (11.84–17.12 GHz, 2.5 mm), and the minimum reflection loss (RLmin) is as low as ?52.54 dB (4.5 mm), which is achieved by superior impedance matching and strong conduction loss together with polarization loss due heterogeneous interfaces and carbon defects. Our work provides a new perspective and a simple method for the large-scale production of high-efficiency biomass-based electromagnetic wave absorbents. |
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| Keywords: | Loofah sponge Broadband and strong absorption Conduction loss Interfacial polarization |
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