Waseem Muhammad, Xie Yuxiang, Yu Kesong, Zhou Xiling, Cai Yingchun, Zhang Xiaoli, Liu Baochen, Chen Jingbo
School of Materials Science and Engineering, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450001, China.
School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China.
Polymers (Basel). 2023 Dec 29;16(1):116. doi: 10.3390/polym16010116.
Electromagnetic wave pollution has become a significant harm posed to human health and precision instruments. To shelter such instruments from electromagnetic radiation, high-frequency electromagnetic interference (EMI) shielding materials are extremely desirable. The focus of this research is lightweight, high-absorption EMI shielding composites. Simple aqueous dispersion and drying procedures were used to prepare cotton fiber (CF)-based sheets combined with various zinc oxide (ZnO) contents. These composites were carbonated in a high-temperature furnace at 800 °C for two hours. The obtained CF/ZnO samples have densities of 1.02-1.08 g/cm. The EMI shielding effectiveness of CF-30% ZnO, CF-50% ZnO, and CF-70% ZnO reached 32.06, 38.08, and 34.69 dB, respectively, to which more than 80% of absorption is attributed. The synergetic effects of carbon networks and surface structures are responsible for the high EMI shielding performance; various reflections inside the interconnected networks may also help in improving their EMI shielding performance.
电磁波污染已成为对人类健康和精密仪器造成的重大危害。为了使此类仪器免受电磁辐射影响，极需高频电磁干扰（EMI）屏蔽材料。本研究的重点是轻质、高吸收的EMI屏蔽复合材料。采用简单的水分散和干燥程序制备了结合不同氧化锌（ZnO）含量的棉纤维（CF）基片材。这些复合材料在高温炉中于800°C碳化两小时。所得的CF/ZnO样品密度为1.02 - 1.08 g/cm。CF - 30% ZnO、CF - 50% ZnO和CF - 70% ZnO的EMI屏蔽效能分别达到32.06、38.08和34.69 dB，其中超过80%归因于吸收。碳网络和表面结构的协同效应是高EMI屏蔽性能的原因；互连网络内部的各种反射也可能有助于提高其EMI屏蔽性能。
