Stohmann Patrick, Koch Sascha, Yang Yang, Kaiser Christopher David, Ehrens Julian, Schnack Jürgen, Biere Niklas, Anselmetti Dario, Gölzhäuser Armin, Zhang Xianghui
Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany.
Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom.
Beilstein J Nanotechnol. 2022 May 25;13:462-471. doi: 10.3762/bjnano.13.39. eCollection 2022.
Ultrathin membranes with subnanometer pores enabling molecular size-selective separation were generated on surfaces via electron-induced cross-linking of self-assembled monolayers (SAMs). The evolution of -terphenylthiol (TPT) SAMs on Au(111) surfaces into cross-linked monolayers was observed with a scanning tunneling microscope. As the irradiation dose was increased, the cross-linked regions continued to grow and a large number of subnanometer voids appeared. Their equivalent diameter is 0.5 ± 0.2 nm and the areal density is ≈1.7 × 10 m. Supported by classical molecular dynamics simulations, we propose that these voids may correspond to free volumes inside a cross-linked monolayer.
通过自组装单分子层（SAMs）的电子诱导交联在表面生成了具有亚纳米级孔隙、能够实现分子尺寸选择性分离的超薄膜。利用扫描隧道显微镜观察了金（111）表面的对三联苯硫醇（TPT）SAMs向交联单分子层的演变过程。随着辐照剂量的增加，交联区域不断生长，并出现了大量亚纳米级孔隙。它们的等效直径为0.5±0.2纳米，面密度约为1.7×10米。在经典分子动力学模拟的支持下，我们提出这些孔隙可能对应于交联单分子层内的自由体积。
