Ultratough cellular films from graphene oxide hydrogel: A way to exploit rigidity and flexibility of two-dimensional honeycomb carbon
Ultratough cellular films from graphene oxide hydrogel: A way to exploit rigidity and flexibility of two-dimensional honeycomb carbon
复制标题
由氧化石墨烯水凝胶制成的超韧蜂窝薄膜：一种利用二维蜂窝碳的刚性和柔性的方法
DOI：
10.1016/j.carbon.2016.06.029
复制
发表时间：
2016-10
期刊：
影响因子：
10.9
通讯作者：
Xiaogong Wang
中科院分区：
文献类型：
--
作者：
Zhiyuan Xiong;Xiawei Yun;Bo Tang;Xiaogong Wang
分级多孔石墨烯薄膜的力学性能不能满足需要韧性的广泛应用。在这里，我们报道了一种创新的方法来构建具有取向和相互连接的微结构的各向异性石墨烯基蜂窝薄膜，该薄膜可以提供高强度(2.4M±0.02MJ/m−3)和非凡的韧性(0.10M±0.01MJ/m MJ/m MJ)。多孔膜的比强度(30℃±0.2 Mpa/(mg·m-−3))和比弹性系数(8.40±10.4 Mpa/(mg·m-−3))甚至可以与坚韧的松质骨相媲美。通过剪切和松弛过程得到的氧化石墨烯水凝胶膜，然后用氢碘酸/冰醋酸还原，使定向和相互连接的结构固化，得到最终的多孔膜。通过这种方法，充分利用了单个石墨烯薄板的固有特性，如高的面内刚性和良好的面外柔性。结果表明，复合材料的强度和韧性的显著提高是通过一种协同机制实现的，其中独特的结构通过取向石墨烯的拉伸应变来承受应力，通过桥接的石墨烯的弯曲变形来耗散能量。概念验证的设计和对结构-性质关系的深入理解将有助于石墨烯器件的制备和应用。
The mechanical properties of hierarchically porous graphene films are unsatisfactory for the wide applications requiring toughness. Here, we report an innovative approach to construct anisotropic graphene-based cellular films with an oriented and interlinked microstructure, which can provide both high strength (2.4 ± 0.2 MPa) and extraordinary toughness (0.10 ± 0.01 MJ m−3). The specific strength (30 ± 2 MPa/(Mg m−3)) and specific modulus (8.4 ± 0.4 × 102MPa/(Mg m−3)) of the porous films are even comparable to tough cancellous bone. The graphene oxide hydrogel films obtained from the shear and relaxation procedure are then reduced with hydroiodic acid/acetic acid, which solidifies the oriented and interlinked structures to give the final porous films. By this approach, the intrinsic features of an individual graphene sheet, such as high in-plane rigidity and excellent out-of-plane flexibility, are fully exploited. The great enhancement of strength and toughness is proved to be realized by a synergistic cooperation mechanism, where the unique architecture bears stress through tensile strain of oriented graphene sheets and dissipates energy through bending deformation of the bridged graphene sheets. The proof-of-concept design and deep understanding of the structure-property relationship will be of benefit to the fabrication and applications of graphene-based devices.
登录
查看更多内容
用于高性能柔性超级电容器应用的机械韧性大面积分层多孔石墨烯薄膜
影响因子：
29.4
作者：
Xiong, Zhiyuan;Liao, Cailian;Wang, Xiaogong
通讯作者：
Wang, Xiaogong
四面体连接的细胞结构的新型管状石墨烯形式
影响因子：
29.4
作者：
Bi, Hui;Chen, I-Wei;Huang, Fuqiang
通讯作者：
Huang, Fuqiang
具有超强压缩弹性和近零泊松比的三维粘合海绵状石墨烯材料
影响因子：
16.6
作者：
Wu, Yingpeng;Yi, Ningbo;Chen, Yongsheng
通讯作者：
Chen, Yongsheng
影响因子：
4.9
作者：
Xufeng Zhou;Zhaoping Liu
通讯作者：
Xufeng Zhou;Zhaoping Liu
影响因子：
2.2
作者：
Rho, JY;Kuhn-Spearing, L;Zioupos, P
通讯作者：
Zioupos, P