Implications from Broadband Microwave Absorption of Metal-Modified SiC Fiber Mats
| Autor: | Chao-Fu Wang, Chaojiang Li, Yi Hou, Chaoran Deng, Yong Yang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Permittivity
Materials science business.industry Broad bandwidth 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Microwave absorber Electrospinning 0104 chemical sciences Metal visual_art Broadband visual_art.visual_art_medium Optoelectronics General Materials Science Sic fiber 0210 nano-technology business Microwave |
| Zdroj: | ACS Applied Materials & Interfaces. 12:31823-31829 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c07979 |
| Popis: | Understanding the physical requirements for a broad bandwidth is vital for the design of high-efficiency microwave absorber. Our recent works on silicon carbide (SiC) fiber mats-based absorbers imply that metal modification (e.g., Fe or Hf) could benefit their bandwidth effectively. For verification, we fabricated a Co/SiC fiber mat via a similar electrospinning process and subsequent pyrolysis at 1400 °C in Ar atmosphere. The results indicate that after Co modification, the SiC fiber mats show elevated permittivity and tangent loss. With a proper amount of Co adding, the mats could exhibit a wide bandwidth of around 8 GHz (ranging from 10 to 18 GHz) for effective absorption (reflection loss (RL) less than -10 dB) at 2.8 mm thickness. This is similar to our previous findings, confirming that metal modification could be an effective approach to extend the bandwidth of SiC mat absorbers. Explanations can be found through theoretical analysis with the quarter wavelength (λ/4) cancellation theory. It suggests that the declining permittivity (with the increase of frequency) is the key to keep the wavelength in material (λ |
| Databáze: | OpenAIRE |
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