针尖诱导HOPG上扭曲双层石墨烯超晶格：毛细管吸引效应
The Tip-Induced Twisted Bilayer Graphene Superlattice on HOPG: Capillary Attraction Effect
摘要：
我们利用扫描隧道显微镜（STM）的针尖，通过人为增加针尖与样品在潮湿环境中的相互作用，在高取向热解石墨（HOPG）表面上操纵单个弱结合的纳米片。用这种方法可以将石墨片沿台阶方向撕开，折叠到HOPG表面上，从而得到六方对称的加芬超晶格。详细讨论了针尖与样品表面的相互作用，包括范德华力、静电力和由于针尖与样品之间形成高度弯曲的流体弯月面而产生的拉普拉斯压力引起的毛细吸引力，以了解针尖诱导石墨超晶格的形成机理。特别是在湿度条件下，毛细力是控制石墨表面层的关键。该方法为制备可控超晶格和石墨烯纳米带提供了一条简单可行的途径，同时也补充和发现了利用针尖在HOPG表面生成石墨烯超晶格的理论。
英文摘要：
We use the tip of the scanning tunneling microscope (STM) to manipulate single weakly bound nanometer-sized sheets on the the highly oriented pyrolytic graphite (HOPG) surface through artifically increasing the tip and sample interaction in humid environment. By this means it is possible to tear apart a graphite sheet againt a step and fold this part onto the HOPG surface and thus generate the gaphene superlattices with hexagonal symmetry. The tip and sample surface interactions, including the van der Waals force, eletrostatic force and capillary attraction force originating from the Laplace pressure due to the formation of a highly curved fluid meniscus connecting the tip and sample, are discussed in details to understand the fromation mechnism of graphen superlattice induced by the STM tip. Especially, the capillary force is the key role in manipulating the graphite surface sheet in the hunmidity condition. Our approach may provides a simple and feasible route to prepare the controllable superlattices and graphene nanoribbons but also replenish and find down the theory of generation of graphene superlattice on HOPG surface by the tip.
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。
