Zhang Shu, Huang Xuewu, Xiao Wei, Zhang Lulu, Yao Hang, Wang Ling, Luo Junchen, Gao Jiefeng
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China.
State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, P. R. China.
ACS Appl Mater Interfaces. 2021 May 12;13(18):21865-21875. doi: 10.1021/acsami.1c05319. Epub 2021 Apr 29.
With booming development of electronics, electromagnetic interference (EMI) shielding materials based on conductive polymer composites (CPCs) have received increasing attention. However, it remains challenging to develop flexible and lightweight CPCs with excellent stretchability, breathability, durability, and high EMI shielding effectiveness (EMI SE). Here, we propose a facile polyvinylpyrrolidone (PVP) assisted preparation of highly electrically conductive and durable nanofiber composites for high performance EMI shielding. The PVP layer could not only greatly enhance the interfacial interaction between the Ag nanoparticles (AgNPs) and hence the mechanical properties (both tensile strength, Young's modulus and elongation at break) of the polymer nanofiber membrane but also forms a protection layer preventing the AgNPs from oxidizing. The electrical conductivity of the nanofiber composite can reach up to 245.7 ± 30.6 S/cm, which is, to a large degree, maintained after cyclic stretching, abrasion, and ultrasonic washing. In addition, the nanofiber composite exhibits excellent breathability, antibacterial, and Joule heating performance. When used as the EMI shielding material, the nanofiber composite shows an extremely high SE and SSE of ∼96.9 dB and 169.7 dB cm/g, respectively, and EMI shielding performance possesses outstanding stability and durability. This multifunctional nanofibrous composite membrane exhibits promising applications in wearable electronics.
随着电子技术的蓬勃发展，基于导电聚合物复合材料（CPCs）的电磁干扰（EMI）屏蔽材料受到了越来越多的关注。然而，开发具有优异拉伸性、透气性、耐久性和高电磁干扰屏蔽效能（EMI SE）的柔性轻质CPCs仍然具有挑战性。在此，我们提出一种简便的聚乙烯吡咯烷酮（PVP）辅助制备方法，用于制备高性能电磁干扰屏蔽的高导电性和耐用的纳米纤维复合材料。PVP层不仅可以大大增强银纳米颗粒（AgNPs）之间的界面相互作用，从而提高聚合物纳米纤维膜的机械性能（拉伸强度、杨氏模量和断裂伸长率），还能形成一层保护层，防止AgNPs氧化。纳米纤维复合材料的电导率可达245.7±30.6 S/cm，在循环拉伸、磨损和超声清洗后，在很大程度上仍能保持。此外，纳米纤维复合材料还具有优异的透气性、抗菌性和焦耳热性能。当用作电磁干扰屏蔽材料时，纳米纤维复合材料分别显示出极高的屏蔽效能（SE）和比屏蔽效能（SSE），约为96.9 dB和169.7 dB cm/g，并且电磁干扰屏蔽性能具有出色的稳定性和耐久性。这种多功能纳米纤维复合膜在可穿戴电子设备中具有广阔的应用前景。
