学科进展 学科进展

最小化 最大化

 

具有高磁性和高导电性的透明柔性多功能薄膜

 

 

 

 

 10.1021/acsami.7b02443

 

多功能薄膜因其用途广泛一直是科学界的研究热点。同时具备磁性和导电性的透明多功能薄膜将在很多领域发挥重要作用,比如电磁屏蔽、磁性开关、磁性导电膜、微波吸收、组织工程、废水中去除有机和无机污染物或重金属离子、甚至在生物催化领域等。

最近,上海理工大学夏亿劼副教授新加坡国立大学欧阳建勇教授团队发明了这种新型的同时具有高导电性和高磁性的透明柔性多功能薄膜。他们把导电高分子水溶液(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸PEDOT/PSS)和大约有20nm的四氧化三铁(Fe3O4)纳米颗粒均匀混合在一起形成复合材料,通过旋涂的方法制备成薄膜。这种PEDOT:PSS/Fe3O4薄膜经过甲基碘化胺有机盐溶液简单处理后,电导率能达到1080 S/cm。同时它还具有25.5 emu/g的饱和磁化强度和812.5 GHz的频率范围(X波段)超过40 dB的电磁屏蔽效能。这种薄膜还具有高透明度、柔韧性好、成本低、重量轻等优点。此外,他们还分别制备了高导电性和高磁性的透明柔性PEDOT:PSS/Fe3O4-蚕丝复合纤维和PEDOT:PSS/Fe3O4-棉复合纤维

Multifunctional materials can have important applications in many areas. Materials with both magnetic and electrical properties have been attracting immense attention because they have important application in many areas, such as electromagnetic interference (EMI) shielding, magnet-controlled switches, magnetic and conductive membranes , microwave absorbtion, tissue engineering, removal of organic and inorganic pollutants or heavy metal ions from waste waterand also biocatalytic field.

Recently, Yijie Xia who working in the School of Mechanical Engineering, University of Shanghai for Science and Technology and Jianyong Ouyang who working in the Department of Materials and Engineering, National University of Singapore made the following outcome. In this work, they fabricated the transparent and flexible multifunctional with high conductivity and magnetic properties. The films were formed from a poly(3,4ethylenedioxythiophene) : poly(styrenesulfonate) (PEDOT:PSS; Clevios PH1000) aqueous solution added with iron oxide (Fe3O4) nanoparticles that have a size of 20 nm by spin-coating. The PEDOT:PSS/Fe3O4 films have a high conductivity of 1080 S/cm through treatment with methylammonium iodide in an organic solvent. The high conductivity PEDOT:PSS/Fe3O4 films can also have a saturation magnetization of 25.5 emu/g and an EMI shielding effectiveness of more than 40 dB in the 812.5 GHz (X band) frequency range. The PEDOT:PSS/Fe3O4 films have additional advantages, like excellent transparency, good mechanical flexibility, low cost, and light weight. In addition, they fabricated flexible PEDOT:PSS/Fe3O4 silk or cotton threads fibers with a high magnetism and conductivity.

(闫欢欢)