论文标题
直接成像，三维相互作用光谱和原子级波纹的摩擦各向异性在MOS $ _ {2} $上
Direct Imaging, Three-dimensional Interaction Spectroscopy, and Friction Anisotropy of Atomic-scale Ripples on MoS$_{2}$
论文作者
论文摘要
理论预测，二维（2D）材料只有在原子长度尺度上存在非平面变形的情况下才存在，通常称为涟漪。虽然可以通过电子显微镜检测到这种涟漪，但它们通过基于表面的技术进行直接观察，并在相互作用力和能量方面进行表征仍然有限，从而阻止了它们对机械特性的影响的明确研究，包括但不限于摩擦各向异性。在这里，我们采用高分辨率原子力显微镜来证明在二硫化钼的几层钼样品上存在原子尺度波纹（MOS $ _ {2} $）。三维力 /能量光谱用于研究波纹对相互作用景观的影响。摩擦力显微镜揭示了摩擦各向异性的多个对称性，可以通过研究波纹样品区域作为扫描大小的函数来解释。我们的实验有助于持续发展对2D材料的纳米级力学的严格理解。
Theory predicts that two-dimensional (2D) materials may only exist in the presence of out-ofplane deformations on atomic length scales, frequently referred to as ripples. While such ripples can be detected via electron microscopy, their direct observation via surface-based techniques and characterization in terms of interaction forces and energies remain limited, preventing an unambiguous study of their effect on mechanical characteristics, including but not limited to friction anisotropy. Here, we employ high-resolution atomic force microscopy to demonstrate the presence of atomic-scale ripples on supported samples of few-layer molybdenum disulfide (MoS$_{2}$). Three-dimensional force / energy spectroscopy is utilized to study the effect of ripples on the interaction landscape. Friction force microscopy reveals multiple symmetries for friction anisotropy, explained by studying rippled sample areas as a function of scan size. Our experiments contribute to the continuing development of a rigorous understanding of the nanoscale mechanics of 2D materials.
