Multifunctionality and control of the crumpling and unfolding of large-area graphene.
Multifunctionality and control of the crumpling and unfolding of large-area graphene.
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DOI：
10.1038/nmat3542
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发表时间：
2013-04
期刊：
影响因子：
41.2
通讯作者：
Zhao X
中科院分区：
文献类型：
--
作者：
Zang J;Ryu S;Pugno N;Wang Q;Tu Q;Buehler MJ;Zhao X
皱巴巴的石墨烯薄膜广泛应用于电子、储能、复合材料和生物医药等领域。虽然已知石墨烯的卷曲程度会影响石墨烯的性质以及石墨烯基器件和材料的性能，但卷曲石墨烯薄膜的可控折叠和展开尚未得到证实。在这里，我们报告了一种可逆控制大面积石墨烯片的皱缩和展开的方法。我们通过实验、原子模拟和理论证明，通过利用附着在双轴预拉伸聚合物基底上的石墨烯的机械不稳定性，并通过以特定顺序控制预拉伸的松弛，石墨烯薄膜可以被揉成定制的自组织分层结构，模拟超疏水叶子。该方法使我们能够制造大面积导电涂层和电极，具有超疏水性、高透明度、可调润湿性和透光性。我们还证明了皱褶的石墨烯-聚合物层压板可以用作人工肌肉驱动器。
Crumpled graphene films are broadly used, for instance in electronics, energy storage, composites, and biomedicine. Although it is known that the degree of crumpling affects graphene's properties and the performance of graphene-based devices and materials, the controlled folding and unfolding of crumpled graphene films has not been demonstrated. Here we report an approach to reversibly control the crumpling and unfolding of large-area graphene sheets. We show with experiments, atomistic simulations and theory that, by harnessing the mechanical instabilities of graphene adhered on a biaxially pre-stretched polymer substrate and by controlling the relaxation of the pre-strains in a particular order, graphene films can be crumpled into tailored self-organized hierarchical structures that mimic superhydrophobic leaves. The approach enables us to fabricate large-area conductive coatings and electrodes showing superhydrophobicity, high transparency, and tunable wettability and transmittance. We also demonstrate that crumpled graphene-polymer laminates can be used as artificial-muscle actuators.
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