从粘合剂基底上剥离石墨烯片产生锥形纳米带
Tearing Graphene Sheets From Adhesive Substrates Produces Tapered Nanoribbons
摘要：
石墨烯是一种真正的二维原子晶体，具有特殊的电子和机械性能。虽然传统的块状和薄膜材料已经被广泛研究，但石墨烯的关键机械性能，如撕裂和开裂，仍然未知，部分原因是其二维性质和最终的单原子层厚度，这导致传统材料模型的崩溃。通过结合第一性原理ReaxFF分子动力学和实验研究，自下而上的研究从粘合剂衬底的石墨烯片撕裂，包括锥形石墨烯纳米带的形成的观察。通过仔细分析的潜在的分子断裂机制，它表明，所得到的纳米取向的几何形状是由石墨烯基板的粘附能和撕裂的石墨烯层的数量控制。通过将石墨烯作为更广泛的二维原子晶体的模型材料，这些结果为高度受限的纳米材料的撕裂和开裂机制提供了基本的见解。
英文摘要：
Graphene is a truly two-dimensional atomic crystal with exceptional electronic and mechanical properties. Whereas conventional bulk and thin-film materials have been studied extensively, the key mechanical properties of graphene, such as tearing and cracking, remain unknown, partly due to its two-dimensional nature and ultimate single-atom-layer thickness, which result in the breakdown of conventional material models. By combining first-principles ReaxFF molecular dynamics and experimental studies, a bottom-up investigation of the tearing of graphene sheets from adhesive substrates is reported, including the observation of the formation of tapered graphene nanoribbons. Through a careful analysis of the underlying molecular rupture mechanisms, it is shown that the resulting nanoribbon geometry is controlled by both the graphene-substrate adhesion energy and by the number of torn graphene layers. By considering graphene as a model material for a broader class of two-dimensional atomic crystals, these results provide fundamental insights into the tearing and cracking mechanisms of highly confined nanomaterials.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
