The heterointerface of graphene in-situ growth for enhanced microwave attenuation properties in La-doped SiBCN ceramics |
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| Affiliation: | 1. School of Mechanical Engineering, Shandong University of Technology, Zibo, 255000, China;2. School of Materials Science and Engineering, Shandong University of Technology, Zibo, 255000, China;3. Institute of Additive Manufacturing, Shandong University of Technology, Zibo, 255000, China;4. Shandong Industrial Ceramics Research & Design Institute Co., Ltd., Zibo, 255000, China;5. School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255000, China;1. Technical University of Ko?ice, Faculty of Materials, Metallurgy and Recycling, Institute of Metallurgy, Letná 9, 042 02, Ko?ice, Slovakia;2. Institute of Materials Research - Slovak Academy of Sciences, Watsonova 47, 040 01, Ko?ice, Slovakia;3. KERAG, s.r.o, Ko?ice, Slovakia;1. State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China;2. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China;3. BGRIMM Magnetic Materials & Technology Co, Ltd, Beijing, 102600, China;1. School of Intelligent Manufacturing, Chengdu Technological University, Chengdu, 610031, China;2. College of Mechanical Engineering & Graduate School, Chiba University, Chiba, 262-8522, Japan;3. Tokyo Metropolitan College of Industrial Technology, Tokyo, 116-8523, Japan;4. Chiba Industrial Technology Research Institute, Chiba, 264-0017, Japan;1. Faculty of Chemistry, Southern Federal University, Rostov-on-Don, Russia;2. Southern Scientific Center of Russian Academy of Science, Rostov-on-Don, Russia |
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| Abstract: | The electromagnetic wave (EMW) absorbing materials are widely applied to attenuate the useless and harmful EMW generated from wireless communication and 5G networks, which could protect the human health and electronic device safety. In this study, La-doped SiBCN ceramics with broadband EMW absorption capability were prepared via generating abundance of heterointerfaces, as graphene were in-situ grown by La2O3 catalyzing. The graphene in-situ formed in the ceramics can be attributed to the La atom decreasing the potential energy of the free carbon ring nucleation from ?760.9 Ha to ?8984.3 Ha. Consequently, the electrical conductivity of the SiBCN ceramics improved from 12.360 S/m to 18.025 S/m, the minimum reflection loss (RLmin) obtained was ?26.48 dB at 7.2 GHz and the effective absorption bandwidth (EAB) was 6.32 GHz (11.68–18.00 GHz) at a thickness of 1.7 mm. At 700 °C, the RLmin and EAB values reached ?43.18 dB and 4.2 GHz, respectively. The enhanced EMW absorbing capability can be attributed to the rationally tailor the heterointerfaces to improve the polarization loss and conduction loss of the SiBCN ceramics. The interfaces between graphene and amorphous phases generate built-in electric fields and space chare regions to strengthen the interface polarization, while the electrons migrating rapidly in the graphene and other crystals improved the electrical conductivity. The positive effect of heterointerfaces regulation of graphene in-situ growth improved the dielectric loss capacity of the SiBCN ceramics; therefore, this study provides a feasible method to enhance the EMW absorption capability of polymer-derived ceramics. |
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| Keywords: | SiBCN ceramics Heterointerface Dielectric loss EMW absorbing |
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