Teeter Jordan, Kim Na Yeon, Debnath Topojit, Sesing Nicholas, Geremew Tekwam, Wright Dylan, Chi Miaofang, Stieg Adam Z, Miao Jianwei, Lake Roger K, Salguero Tina, Balandin Alexander A
Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.
California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
Adv Mater. 2024 Nov;36(48):e2409898. doi: 10.1002/adma.202409898. Epub 2024 Oct 14.
Experiments with graphene have demonstrated that 2D van der Waals materials can be stable, robust, and efficiently manipulated at the level of individual atomic planes. However, the stability and manipulation of 1D van der Waals materials and individual atomic chains remains elusive. Here, the ability to exfoliate and process two representative van der Waals materials containing 1D motifs, namely MoI and TaSeI, at the scale of individual atomic chains is demonstrated. High-resolution transmission electron microscopy and atomic force microscopy studies confirm the presence of stable individual atomic chains of MoI at room temperature. It is further shown that 1D van der Waals materials with low exfoliation energy, such as TaSeI, can be processed with electron beams to achieve suspended individual atomic chains. Ab initio calculations corroborate the findings regarding the cleavage energies and the thermodynamic stability of individual atomic chains in these 1D van der Waals materials. These results demonstrate that the top-down approach in material processing can be extended to the scale of individual chains.
对石墨烯的实验表明，二维范德华材料在单个原子平面层面可以是稳定、坚固且能被有效操控的。然而，一维范德华材料和单个原子链的稳定性及操控性仍然难以捉摸。在此，展示了在单个原子链尺度上剥离和加工两种含有一维结构单元的代表性范德华材料（即MoI和TaSeI）的能力。高分辨率透射电子显微镜和原子力显微镜研究证实了室温下MoI稳定的单个原子链的存在。进一步表明，具有低剥离能的一维范德华材料，如TaSeI，可以通过电子束加工以实现悬浮的单个原子链。从头算计算证实了关于这些一维范德华材料中单个原子链的裂解能和热力学稳定性的研究结果。这些结果表明，材料加工中的自上而下方法可以扩展到单个链的尺度。
