Twist-spinning assembly of robust ultralight graphene fibers with hierarchical structure and multi-functions
Twist-spinning assembly of robust ultralight graphene fibers with hierarchical structure and multi-functions
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DOI：
10.1016/j.carbon.2019.11.072
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发表时间：
2020-03
期刊：
影响因子：
10.9
通讯作者：
Bingna Zheng;Weiwei Gao;Yingjun Liu;Ran Wang;Zheng Li;Zhen Xu;Chao Gao
中科院分区：
文献类型：
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作者：
Bingna Zheng;Weiwei Gao;Yingjun Liu;Ran Wang;Zheng Li;Zhen Xu;Chao Gao
石墨烯纤维因其在能源设备、压力传感器和电热水器方面的巨大潜力而引起人们的极大兴趣。然而，由于石墨烯片材的低长径比、低缠结和高表面张力，采用干法纺丝策略制备坚固的超轻石墨烯纤维仍然存在一些挑战。在这里，我们提出了一种简便、绿色的干法加捻纺丝组装策略，以制备具有分级结构的超轻石墨烯纤维。由于石墨烯纳米卷的层次化组装，较强的缠绕作用使超轻石墨烯纤维具有较高的机械强度，∼为3.9g±0.05g/mpa。这种轻质石墨烯纤维具有较高的比电导率，S的比电导率为0.951.67cm2g−1，比热导率为42.3W/cm2K的−1g−1，与铜和银的比热导率相当。因此，它们表现出超快的电热响应(5943K和S−1)，超过了已报道的碳纳米管薄膜的记录值(3500K和S−1)。这种简便、绿色的干法纺丝技术为超轻质石墨烯纤维的制备和应用提供了新的机遇。
Graphene fibers attract tremendous interest due to their huge potentials in energy devices, pressure sensors, and electro-heaters. However, there still remain some challenges to prepare robust ultralight graphene fibers by a dry spinning strategy due to the low aspect ratio, poor entanglements and high surface tension of graphene sheets. Here, we present a facile and green dry twist-spinning assembly strategy to prepare ultralight graphene fibers with hierarchical structure. Because of hierarchical assembly, stronger entanglements of graphene nanoscrolls endow ultralight graphene fibers high mechanical strength of ∼3.9 ± 0.5 MPa. Such light graphene fibers show high specific electrical conductivity of 0.95–1.67 S m2g−1and specific thermal conductivity of 42.3–100 W cm2K−1g−1, which are comparative to that of copper and silver. Therefore, they exhibit ultrafast electro-thermal response (5943 K s−1), which exceeds the record value of carbon nanotube (CNT) film ever reported (3500 K s−1). Such facile and green dry spinning strategy offers new opportunity to prepare and apply the ultralight graphene fibers.