Wet-Spinning of Continuous Montmorillonite-Graphene Fibers for Fire-Resistant Lightweight Conductors
Wet-Spinning of Continuous Montmorillonite-Graphene Fibers for Fire-Resistant Lightweight Conductors
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DOI：
10.1021/acsnano.5b00616
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发表时间：
2015-05-01
期刊：
影响因子：
17.1
通讯作者：
Gao, Chao
中科院分区：
文献类型：
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作者：
Fang, Bo;Peng, Li;Gao, Chao
由具有迷人性能的纯20晶体组成的全无机纤维（例如，交替堆叠层、高机械强度、有利的导电性和耐火性）。我们开发了一种湿纺组装策略，通过以9 cm/s的速率掺入氧化石墨烯（GO）液晶（LC）模板来获得连续的蒙脱土（MMT）纳米片的全无机纤维，并且GO LC的模板作用通过原位共聚焦激光扫描显微镜和偏光显微镜检查来证实。经过热还原处理后，得到的由纯二维晶体组成的二元复合纤维，既具有蒙脱土纳米片的优异阻燃性，又具有石墨烯纳米片的优异导电性。高分辨透射电子显微镜和扫描电子显微镜观察揭示了纤维的微观结构与复杂的堆叠层。MMT-石墨烯纤维显示出随着石墨烯分数的增加而增加的拉伸强度（88-270 MPa）和电导率（130-10500 S/m）。考虑到MMT-石墨烯（10/90）纤维在高温空气中的上级性能超过商用1700碳纤维，MMT-石墨烯（10/90）纤维被用作耐火（在空气中的承受温度：600-700摄氏度）、轻质（rho < 1.62 g/cm（3））导体（电导率：高达1.04 × 10（4）S/m）。我们将蒙脱土-石墨烯纤维的阻燃性归因于蒙脱土层的盔甲状保护，其可以保护石墨烯层免受氧化蚀刻的作用。当用酒精灯加热到红光时，复合纤维作为耐火导体工作得很好。我们的GO LC模板湿法纺丝策略也可能激发其他层状晶体连续组装成高性能复合纤维。
All-inorganic fibers composed of neat 20 crystals possessing fascinating performance (e.g., alternately stacking layers, high mechanical strength, favorable electrical conductivity, and fire-resistance) are discussed in detail. We developed a wet-spinning assmebly strategy to achieve continuous all-inorganic fibers of montmorillonite (MMT) nanoplatelets by incorporation of a graphene oxide (GO) liquid crystal (LC) template at a rate of 9 cm/s, and the templating role of GO LC is confirmed by in situ confocal laser scanning microscopy and polarized optical microscopy inspections. After protofibers underwent thermal reduction, the obtained binary complex fibers composed of neat 2D crystals integrate the outstanding fire-retardance of MMT nanoplatelets and the excellent conductivity of graphene nanosheets. High-resolution transmission electron microscopy and scanning electron microscope observations reveal the microstructures of fibers with compactly stacking layers. MMT-graphene fibers show increaing tensile strengths (88-270 MPa) and electrical conductivities (130-10500 S/m) with increasing graphene fraction. MMT-graphene (10/90) fibers are used as fire-resistant (bearing temperature in air: 600-700 degrees C), lightweight (rho < 1.62 g/cm(3)) conductors (conductivity: up to 1.04 x 10(4) S/m) in view of their superior performance in high-temperature air beyond commercial 1700 carbon fibers. We attribute the fire-resistance of MMT-graphene fibers to the armor-like protection of MMT layers, which could shield graphene layers from the action of oxidative etching. The composite fibers worked well as fire-resistant conductors when being heated to glowing red by an alcohol lamp. Our GO LC-templating wet-spinning strategy may also inspire the continuous assembly of other layered crystals into high-performance composite fibers.