Collaborative Research: Measurements and Implications of Graphene Adhesion - A Coherent Study via Experiments and Modeling

这笔赠款为表征和操作石墨烯的粘附性提供了资金，石墨烯是一层密集排列在蜂窝状晶格中的单层碳原子，已被证明具有非凡的机械、光学、热和电子性能。附着力决定了石墨烯在周围材料上的形态，而石墨烯的形态又与石墨烯的电子和机械性能密切相关。然而，石墨烯的粘附性在很大程度上还没有被研究，部分原因是传统的粘附性度量方法在处理极小尺寸的样品时变得不适用。该项目绕过了以前的限制，直接从放置在图案化衬底表面和纳米支架上的石墨烯的形态中提取粘附性。将开发一种测量石墨烯与各种材料之间的附着力的计量学，特别是利用非平面衬底上的形态变化。将确定影响石墨烯与表面附着的材料、形态和环境因素。将开发利用表面结构来操纵石墨烯的机械性能的方法。结果将通过一个综合了实验(例如原子力显微镜、电子传输、拉曼光谱)和理论(例如多尺度理论和数值模拟)的研究框架来实现。目前，石墨烯在下一代电子和先进复合材料中的应用受到了极大的关注。附着力在石墨烯与其他材料之间的相互作用中起着至关重要的作用，是未来石墨烯器件和应用成功的关键。如果成功，该项目将有助于理解石墨烯附着和形态之间的相互作用，这也可能对石墨烯的其他性质产生影响。该项目开发的高能框架和实验方案可以很容易地适用于其他超薄膜，因此有可能影响广泛的其他功能材料的计量技术。

This grant provides funding for characterizing and manipulating the adhesive properties of graphene, a single layer of carbon atoms densely packed into a honeycomb lattice that have been shown to have extraordinary mechanical, optical, thermal and electronic properties. Adhesion dictates graphene morphology on surrounding materials, which is in turn closely tied to the electronic and mechanical properties of the graphene. However, the adhesive properties of graphene are largely unexplored, partly because the traditional metrologies of adhesion become unsuitable when dealing with samples of extremely small dimensions. This project bypasses previous limitations by extracting adhesive properties directly from the morphology of graphene placed on patterned substrate surfaces and nano-scale scaffolds. A metrology will be developed to measure the adhesion between graphene and a wide-range of materials, particularly using morphological changes on non-flat substrates. The material, morphological, and environmental factors that influence graphene adhesion to surfaces will be determined. Methods will be developed to manipulate the mechanical properties of graphene using surface structures. Results will be achieved through a research framework that integrates experiments (e.g., atomic force microscopy, electronic transport, Raman spectroscopy) and theory (e.g., multi-scale theoretical and numerical modeling). There is currently great interest in exploring applications for graphene in next-generation electronics and advanced composite materials. Adhesion plays a pivotal role in the interplay between graphene and other materials, so is a key to the success of future graphene devices and applications. If successful, this project will contribute to an understanding of the interplay between graphene adhesion and morphology which could also have implications for other graphene properties. The energetic framework and experimental protocols developed in this project can be readily adapted to other ultrathin films, and thus have the potential to impact metrology techniques for a wide range of other functional materials.