College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China.
School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China.
J Colloid Interface Sci. 2018 Nov 15;530:113-119. doi: 10.1016/j.jcis.2018.06.052. Epub 2018 Jun 22.
Lightweight and robust carbon nanotube (CNT)/chitosan (CS) foams were assembled by a facile unidirectional freeze-drying method in this work. The CNT/CS foam exhibited an excellent electromagnetic interference (EMI) shielding effectiveness (SE) of 37.6 dB while the density was only 17.6 mg·cm, and thus the corresponding specific SE was up to 8556 dB·cm·g. The superior EMI shielding performance was mainly attributed to the perfect conductive networks. Additionally, the absorption coefficient of CNT/CS foam was up to 81.73% under high EMI SE of 37.6 dB, which was remarkable among the reported EMI shielding materials with comparable EMI shielding level. More importantly, the addition of CS significantly increased the compressive strength and modulus of CNT/CS foam to 34.1 KPa and 177.1 KPa, which were 84% and 149% higher than those for the pure CNT foam, respectively. These results indicate that the CNT/CS foam is an ideal high-efficient EMI shielding material, which has high potential applications in the fields of aerospace, automotive, and electronic devices.
在这项工作中，采用简便的单向冷冻干燥法组装了轻质且坚固的碳纳米管（CNT）/壳聚糖（CS）泡沫。CNT/CS 泡沫的电磁干扰（EMI）屏蔽效能（SE）达到了 37.6dB，而密度仅为 17.6mg·cm，因此相应的比 SE 高达 8556dB·cm·g。优异的 EMI 屏蔽性能主要归因于完美的导电网络。此外，在 37.6dB 的高 EMI SE 下，CNT/CS 泡沫的吸收系数高达 81.73%，在具有可比 EMI 屏蔽水平的报道的 EMI 屏蔽材料中是显著的。更重要的是，CS 的添加将 CNT/CS 泡沫的抗压强度和模量分别提高到 34.1kPa 和 177.1kPa，分别比纯 CNT 泡沫高 84%和 149%。这些结果表明，CNT/CS 泡沫是一种理想的高效 EMI 屏蔽材料，在航空航天、汽车和电子设备等领域具有很高的应用潜力。
