School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU) , Suwon 16419, Korea.
Samsung Advanced Institute of Technology (SAIT) , Suwon 16678, Korea.
ACS Appl Mater Interfaces. 2017 Nov 22;9(46):40628-40637. doi: 10.1021/acsami.7b12147. Epub 2017 Nov 13.
The introduction of inorganic nanoparticles into carbon nanotube (CNT) papers can provide a versatile route to the fabrication of CNT papers with diverse functionalities, but it may lead to a reduction in their mechanical properties. Here, we describe a simple and effective strategy for the fabrication of mechanically robust magnetic CNT papers for electromagnetic interference (EMI) shielding and magnetomechanical actuation applications. The magnetic CNT papers were produced by vacuum filtration of an aqueous suspension of CNTs, CoFeO nanoparticles, and poly(vinyl alcohol) (PVA). PVA plays a critical role in enhancing the mechanical strength of CNT papers. The magnetic CNT papers containing 73 wt % of CoFeO nanoparticles exhibited high mechanical properties with Young's modulus of 3.2 GPa and tensile strength of 30.0 MPa. This magnetic CNT paper was successfully demonstrated as EMI shielding paper with shielding effectiveness of ∼30 dB (99.9%) in 0.5-1.0 GHz, and also as a magnetomechanical actuator in an audible frequency range from 200 to 20 000 Hz.
将无机纳米粒子引入碳纳米管（CNT）纸中，可以为制造具有多种功能的 CNT 纸提供一种通用的方法，但这可能会导致其机械性能下降。在这里，我们描述了一种简单而有效的策略，用于制造用于电磁干扰（EMI）屏蔽和磁机械致动应用的机械坚固的磁性 CNT 纸。磁性 CNT 纸是通过 CNT、CoFeO 纳米粒子和聚乙烯醇（PVA）的水悬浮液的真空过滤制备的。PVA 在增强 CNT 纸的机械强度方面起着关键作用。含有 73wt%CoFeO 纳米粒子的磁性 CNT 纸表现出高机械性能，杨氏模量为 3.2GPa，拉伸强度为 30.0MPa。这种磁性 CNT 纸成功地用作 EMI 屏蔽纸，在 0.5-1.0GHz 范围内的屏蔽效能约为 30dB（99.9%），并且还可用作 200-20000Hz 声频范围内的磁机械致动器。
