复合金属层包覆碳纳米管的制备及电磁屏蔽性能

Electromagnetic shielding performance research of composite metal plating carbon nanotubes

摘要:

对碳纳米管(CNTs)进行复合金属包覆，可以发挥不同组元间的复合效应，提高在高频范围的电磁屏蔽性能。本文对CNTs进行预处理后，采用超声喷雾化学镀的方法来制备镀镍碳纳米管(Ni-CNTs)，在此基础上分别采用化学镀和共沉淀法制备镍银包覆碳纳米管(Ni/Ag-CNTs)和镍铜包覆碳纳米管(Ni/Cu-CNTs)。采用TEM、FESEM和XRD对镀层形态及结构进行表征，结果表明，采用超声喷雾化学镀方法，在改善CNTs分散性的前提下可实现镍层在其表面均匀连续镀覆；并结合化学镀和共沉淀法分别成功制备出Ni/Ag-CNTs和Ni/Cu-CNTs。电磁屏蔽测试表明，Ni/Ag-CNTs和Ni/Cu-CNTs的电磁屏蔽性能显著优于Ni-CNTs (55.62dB)，分别达到了89.34 dB和72.21 dB。

Abstract:

Carbon nanotubes(CNTs) coated with metals will show further improvement of electromagnetic shielding performance，due to the composite effect of CNTs and metal coatings. In this paper, Ni-coated CNTs (Ni-CNTs)were firstly prepared with a novel electroless plating method assisted with ultrasonic spray atomization, and then silver coated Ni-CNTs(Ni/Ag-CNTs) and copper coated Ni-CNTs(Ni/Cu-CNTs) were prepared respectively by electroless plating or coprecipitation. The obtained composite powders were characterized by TEM、FESEM and XRD. The Ni-CNTs showed continuous and uniform nickel layers on highly dispersed CNTs，and both the Ni/Ag-CNTs and Ni/Cu-CNTs composite powders showed the morphology of Ni-CNTs embedded in silver or copper particles. The multi-metal coated CNTs showed significant improvement of electromagnetic shielding properties, and the shielding effectiveness of Ni/Ag-CNTs, Ni/Cu-CNTs and Ni-CNTs was 89.34 dB, 72.21 dB and 55.62 dB, respectively.