具有高磁性和高导电性的透明柔性多功能薄膜

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，上海理工大学的夏亿劼副教授和新加坡国立大学的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聚(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的饱和磁化强度和在8−12.5 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 water，and 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 8−12.5 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 fabricatedflexible PEDOT:PSS/Fe₃O₄ silk or cotton threads fibers with a high magnetism and conductivity.

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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，上海理工大学的夏亿劼副教授和新加坡国立大学的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聚(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的饱和磁化强度和在8−12.5 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 water，and 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 8−12.5 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 fabricatedflexible PEDOT:PSS/Fe₃O₄ silk or cotton threads fibers with a high magnetism and conductivity.

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