Multifunctional free-standing membrane from the self-assembly of ultralong MnO2 nanowires.
Multifunctional free-standing membrane from the self-assembly of ultralong MnO2 nanowires.
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DOI：
10.1021/am401774r
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发表时间：
2013-07
影响因子：
9.5
通讯作者：
B. Lan;Lin Yu;Ting Lin;G. Cheng;Ming Sun;Fei Ye;Qingfeng Sun;Jun He
中科院分区：
文献类型：
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作者：
B. Lan;Lin Yu;Ting Lin;G. Cheng;Ming Sun;Fei Ye;Qingfeng Sun;Jun He
在这项工作中，我们报告了通过一种简单的真空过滤方法来制备具有很强的机械稳定性和灵活性的自立膜。场发射扫描电子显微镜图像表明，由MnO2纳米线组成的膜宽为50 nm，长达100μm，纳米线平行组装成束状。提出了一种可能的超长纳米线和自支撑膜的形成机制。同时，通过不同材料的混合可以控制膜的性能，得到复合膜。为了展示MnO2膜的广泛适用性，我们通过不同的材料改性，包括CoFe2O4纳米颗粒和有机三乙氧基(辛基)硅烷，制备了各种新型的复合膜，包括磁性和亲水性和疏水性可逆切换的润湿性。此外，两种材料还可以同时对自支撑膜进行功能化处理，表现出多种性能。本发明的制备方法简单，对环境友好，易于工业化生产。这些复合膜是对先进技术的重大贡献。
In this work, we report the preparation of a free-standing membrane with strong mechanical stability and flexibility through a facile vacuum filtration approach. A field-emission scanning electron microscopy image demonstrates that the membrane composed of MnO2 nanowires is 50 nm in width and up to 100 μm long and the nanowires are assembled in parallel into bundles. A possible formation mechanism for the ultralong nanowires and the free-standing membrane has been proposed. Meanwhile, the properties of the membrane could be controlled by incorporating different materials to achieve composite membranes. In order to demonstrate the broad applicability of the MnO2 membrane, we fabricate a variety of composite membranes exhibiting various novel properties including magnetism and reversibly switchable wettability between hydrophilicity and hydrophobicity through various material modification, including CoFe2O4 nanoparticles and organic triethoxy(octyl)silane. Furthermore, the free-standing membrane could also simultaneously be functionalized with two materials, which reveal multiple properties. The synthesis method of a free-standing MnO2 membrane is simple and environmentally friendly, and it is easily scalable for industry. These composite membranes constitute a significant contribution to advanced technology.