Department of Materials and Environmental Chemistry, Stockholm University, Stockholm 10691, Sweden.
Nanoscale Horiz. 2021 Apr 1;6(4):341-347. doi: 10.1039/d1nh00073j. Epub 2021 Mar 4.
Graphene oxide (GO) is a classic two dimensional (2D) building block that can be used to develop high-performance materials for numerous applications, particularly in the energy and environmental fields. Currently, the precise assembly of GO nanosheets into macroscopic nanohybrids of superior strength and toughness is desirable, and faces challenges and trade-offs. Herein, we exploited the freshly established polycationitrile method as a powerful molecular crosslinking strategy to engineer ultratough and ultrastrong GO/polymer hybrid films, in which a covalent triazine-based network was constructed in a mild condition to reinforce the interface between GO nanosheets. The tensile strength and toughness reached 585 ± 25 MPa and 14.93 ± 1.09 MJ m, respectively, which, to the best of our knowledge, are the current world records in all GO-based hybrid films. As an added merit of the tailor-made polymer crosslinker, the high mechanical performance can be maintained in large part at an extremely high relative humidity of 98%. This emerging interface-engineering approach paves a new avenue to produce integrated strong-and-tough 2D nanohybrid materials that are useful in aerospace, artificial muscle, energy harvesting, tissue engineering and more.
氧化石墨烯（GO）是一种经典的二维（2D）建筑模块，可用于开发各种应用的高性能材料，特别是在能源和环境领域。目前，期望将 GO 纳米片精确组装成具有更高强度和韧性的宏观纳米杂化材料，但这面临着挑战和权衡。在此，我们利用新建立的聚阳离子腈方法作为一种强大的分子交联策略，来设计超韧和超强的 GO/聚合物杂化薄膜，其中在温和条件下构建基于共价三嗪的网络以增强 GO 纳米片之间的界面。拉伸强度和韧性分别达到 585±25 MPa 和 14.93±1.09 MJ m，据我们所知，这是所有基于 GO 的杂化薄膜中的当前世界纪录。作为定制聚合物交联剂的一个额外优点，在极高的相对湿度 98%下，大部分仍能保持高机械性能。这种新兴的界面工程方法为生产集成的强韧 2D 纳米杂化材料开辟了新途径，这些材料在航空航天、人造肌肉、能量收集、组织工程等领域具有应用价值。
