Ultra-broadband electromagnetic wave absorbent: In-situ generated silica modified conductive carbon fiber aerogels |
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| Affiliation: | 1. College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing, 210023, China;2. National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China;3. School of Chemistry and Materials Science, Nanjing University of Information Science & Technology, Nanjing, 210044, China;1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China;2. WZAMI of HUST, Wenzhou, 325035, China;3. Faculty of Physics and Electronic Sciences, Hubei Key Laboratory of Ferro and Piezoelectric Materials and Devices, Hubei University, Wuhan, 430062, China;4. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China;1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China;2. National Center for International Research of Clean Metallurgy, Central South University, Changsha, 410083, China;3. Guangdong Guangqing Metal Technology Co. Ltd., Yangjiang, Guangdong, 529500, China;1. i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Rua Alfredo Allen, 208, 4200-135, Porto, Portugal;2. INEB – Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, 4200-135, Porto, Portugal;3. FEUP- Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, s/n, 4200-465, Porto, Portugal;4. IPATIMUP – Instituto de Patologia e Imunologia Molecular, Universidade do Porto, Rua Júlio Amaral de Carvalho, 45, 4200-135 Porto, Portugal;5. ISEP - Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4249-015, Porto, Portugal |
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| Abstract: | The research and development of dielectric microwave absorbing materials with broad electromagnetic (EM) response is a significant project in EM wave absorption field. To achieve high-performance absorption and strong interfacial bonding at the same time, thermal-assisted in-situ bonding technology was applied to fabricating the dielectric composite absorbing materials. Thanks to the combination of vacuum filtration and in-situ hydrothermal reaction, the as-prepared binary composite aerogel shows both strong interface contacting and good mechanical stability. In addition, the carbon nanofibers/silica composite aerogel (CSA) exhibits ultra-broad effective bandwidth covering from S to Ku band, originated from the uniform dispersed silica aerogel in conductive carbon fiber network. In details, for CSA1 sample, the maximum reflection loss (RL) values and effective absorption bandwidth reach −46.2 dB (1.8 mm) and 5.2 GHz (1.5 mm). Meanwhile, the optimum RCS reduction values reaches 16.2 dB m2 when the detection theta was set as 0°. For CSA2 sample, the effective absorption bandwidth reaches 8.64 GHz at 1.5 mm, and tends to possess lower frequency EM response covering the S-band. This work exhibits a kind of broad-bandwidth aerogel absorbers at low thickness, which shows huge potential in large-scale production of microwave absorbing devices. |
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| Keywords: | Dielectric composite aerogel Microwave absorption Broad bandwidth |
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