Abstract
Light-weight and high-efficiency electromagnetic interference (EMI) shielding materials have drawn attention. Porous carbon was prepared by waste wheat straw as well as the electromagnetic shielding performance was investigated. The products have a large specific surface area owing to their porous structure. The straw carbon (SC) was prepared at 900 °C called SC-900 °C with a specific surface area of 78.98 m2 g−1 and exhibited a enhanced electromagnetic shielding performance. The average SET value of SC-900 °C is 16.79 dB with 2.0 mm thickness, and it increases to 47.58 dB with 5.0 mm thickness. EMI SE mainly comes from SEA, which means that the absorption plays a dominated role in the shielding mechanism for SC-900 °C material. The excellent electromagnetic shielding performance of SC-900 °C results from the absorption process, the special three-dimensional porous structure, the multiple polarization and scattering, interfacial polarization, as well as the impedance matching. The results show that the SC-900 °C with strong absorption, wide band, and thin thickness can be used as a promising electromagnetic wave absorber.
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The authors appreciate the financial support from the 2017 University Science and Technology Innovation team of Henan Province (Grant No. 17IRTSTHN005) and the National Natural Science Foundation of China (Grant No. 51672254, 51802289).
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Bai, Z., Zhao, B., Deng, J. et al. Light-weight and high-efficiency electromagnetic wave shielding properties based on waste straw porous carbon. J Mater Sci: Mater Electron 31, 4963–4971 (2020). https://doi.org/10.1007/s10854-020-03063-w
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DOI: https://doi.org/10.1007/s10854-020-03063-w