School of Mechanical Engineering, University of Shanghai for Science and Technology , Shanghai 200093, P. R. China.
Department of Materials and Engineering, National University of Singapore , 119796 Singapore.
ACS Appl Mater Interfaces. 2017 Jun 7;9(22):19001-19010. doi: 10.1021/acsami.7b02443. Epub 2017 May 23.
Multifunctional films can have important applications. Transparent and flexible films with high conductivity and magnetic properties can be used in many areas, such as electromagnetic interference (EMI) shielding, magnetic switching, microwave absorption, and also biotechnology. Herein, novel highly conductive and superparamagnetic thin films with excellent transparency and flexibility have been demonstrated. The films were formed from a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS; Clevios PH1000) aqueous solution added with iron oxide (FeO) nanoparticles that have a size of ∼20 nm by spin-coating. The PEDOT:PSS/FeO films have a high conductivity of 1080 S/cm through treatment with methylammonium iodide in an organic solvent. The high-conductivity PEDOT:PSS/FeO films can also have a saturation magnetization of 25.5 emu/g and an EMI shielding effectiveness of more than 40 dB in the 8-12.5 GHz (X band) frequency range. The PEDOT:PSS/FeO films have additional advantages, like excellent transparency, good mechanical flexibility, low cost, and light weight. In addition, we fabricate flexible PEDOT:PSS/FeO silk threads with a high magnetism and conductivity.
多功能薄膜具有重要的应用。具有高导电性和磁性的透明且灵活的薄膜可以用于许多领域，例如电磁干扰 (EMI) 屏蔽、磁开关、微波吸收，以及生物技术。在此，展示了具有优异透明度和柔韧性的新型高导电性和超顺磁性薄膜。通过旋涂添加尺寸约为 20nm 的氧化铁 (FeO) 纳米粒子的聚(3,4-乙二氧基噻吩):聚(苯乙烯磺酸盐) (PEDOT:PSS; Clevios PH1000) 水性溶液形成薄膜。通过在有机溶剂中用碘化甲铵处理，PEDOT:PSS/FeO 薄膜的电导率高达 1080 S/cm。高导电性的 PEDOT:PSS/FeO 薄膜在 8-12.5GHz(X 波段)频率范围内还具有 25.5 emu/g 的饱和磁化强度和超过 40dB 的 EMI 屏蔽效能。PEDOT:PSS/FeO 薄膜具有其他优点，例如透明度高、机械柔韧性好、成本低、重量轻。此外，我们还制备了具有高磁性能和导电性的柔性 PEDOT:PSS/FeO 丝线。
