Ian Daniell Santos, Patrick Tjarks, Jeyavelan Muthu, You-Chen Lin, Zhi-Long Yen, Pradyumna Kumar Chand, Radha Raman, Dinh Tuan Nguyen, Mehdi Rouhani, Yeau-Ren Jeng, Ya-Png Hsieh, Mario Hofmann
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引用次数: 0
摘要
我们展示了通过平面外折叠强化石墨烯这种原子级薄碳同素异形体的过程。通过在水-空气界面对石墨烯进行横向限制,在悬浮薄片中诱发了纳米级屈曲,从而导致在临界表面压力之外出现意想不到的折叠转变。折叠的出现得到了原位布儒斯特角反射和原位显微镜的证实,显示出一种独特的 "z-层状 "纳米结构。分子动力学模拟表明,与横向滑动相比,"Z "形层压增强了相邻薄片之间的粘附力,这一点通过折叠过程中的表面压力滞后得到了证实。机械测试表明,与传统石墨烯组件相比,甚至与复合材料相比,这种材料的杨氏模量和屈服强度都更胜一筹。我们展示了 z 形层压方法在石墨烯基结构材料、摩擦学层和功能性电化学涂层方面的应用潜力。最后,z-层压石墨烯的完全可回收性为实现可持续纳米结构材料开辟了新的途径。
Z-Laminating Assembly of Graphene Nanoflakes for Super-Strong Membranes and Functional Coatings
We demonstrate the strengthening of graphene, an atomically thin carbon allotrope, by out-of-plane folding. Through lateral confinement of graphene at the water–air interface, nanoscale buckling was induced in suspended flakes, leading to an unexpected folding transition beyond a critical surface pressure. The emergence of folding was confirmed by in situ Brewster angle reflectivity and ex situ microscopy, showing a unique “z-laminated” nanostructure. Molecular dynamics simulations indicate that z-lamination yields an enhanced adhesion between neighboring flakes compared to lateral sliding, which was confirmed by a surface pressure hysteresis during the folding process. Mechanical testing reveals superior Young’s modulus and yield strength when compared to conventional graphene assemblies and even compared to composites. We demonstrate the potential of the z-lamination approach for applications in graphene-based structural materials, tribological layers, and functional electrochemical coatings. Finally, the complete recyclability of z-laminated graphene opens up new routes toward sustainable nanostructured materials.
期刊介绍:
ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.