Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University , Seoul 151-744, Korea.
Advanced Nanohybrids Laboratory, Department of Applied Organic Materials Engineering, Inha University , Incheon 402-751, Korea.
ACS Nano. 2016 Feb 23;10(2):2184-92. doi: 10.1021/acsnano.5b06719. Epub 2016 Jan 27.
The self-assembled nanostructures of carbon nanomaterials possess a damage-tolerable architecture crucial for the inherent mechanical properties at both micro- and macroscopic levels. Bone, or "natural composite," has been known to have superior energy dissipation and fracture resistance abilities due to its unique load-bearing hybrid structure. However, few approaches have emulated the desirable structure using carbon nanomaterials. In this paper, we present an approach in fabricating a hybrid composite paper based on graphene oxide (GO) and carbon nanotube (CNT) that mimicks the natural bone structure. The size-tuning strategy enables smaller GO sheets to have more cross-linking reactions with CNTs and be homogeneously incorporated into CNT-assembled paper, which is advantageous for effective stress transfer. The resultant hybrid composite film has enhanced mechanical strength, modulus, toughness, and even electrical conductivity compared to previously reported CNT-GO based composites. We further demonstrate the usefulness of the size-tuned GOs as the "stress transfer medium" by performing in situ Raman spectroscopy during the tensile test.
碳纳米材料的自组装纳米结构具有损伤耐受的结构，这对于微观和宏观层面的固有机械性能至关重要。由于具有独特的承载混合结构，众所周知，骨骼（或“天然复合材料”）具有优异的能量耗散和抗断裂能力。然而，很少有方法使用碳纳米材料来模拟理想的结构。在本文中，我们提出了一种基于氧化石墨烯（GO）和碳纳米管（CNT）的混合复合纸的制备方法，该方法模拟了天然骨骼结构。尺寸调谐策略使较小的 GO 片与 CNT 具有更多的交联反应，并均匀地掺入 CNT 组装的纸张中，这有利于有效应力传递。与以前报道的基于 CNT-GO 的复合材料相比，所得的混合复合膜具有增强的机械强度、模量、韧性，甚至导电性。我们通过在拉伸试验过程中进行原位拉曼光谱进一步证明了尺寸调谐的 GO 作为“应力传递介质”的有用性。
