Mar 6, 2020 · The as-synthesized robust fused aromatic COF (F-COF) exhibits high crystallinity. Its lattice structure is characterized by scanning tunneling microscopy and X-ray diffraction pattern.

Jan 11, 2024 · Two-dimensional (2D) covalent organic frameworks (COFs) fabricated through on-surface synthesis were investigated as a honeycomb nanopore template for the growth of 3 d -transition-metal nanoclusters (NCs) with a size of 2 nm on a metallic substrate.

Nov 7, 2022 · Here we present the on-surface synthesis of one- and two-dimensional covalent organic frameworks whose backbones contain 1,4-disilabenzene (C 4 Si 2) linkers. Silicon atoms were first deposited...

Apr 4, 2023 · Our scanning tunneling microscopy/spectroscopy (STM/STS) investigation of the evolution of electronic structures through such a series of oligomers (monomer, dimer, hexamer macrocycle) provides a deeper understanding of the 2D COF created from the …

Jan 21, 2021 · STM characterization provides direct evidence for the topological structure and formation mechanism of monolayer COF. The construction of high-quality monolayer COF also provides an effective reference for the synthesis of highly crystalline COFs.

Oct 31, 2011 · Two different straightforward synthetic approaches are presented to fabricate long-range-ordered monolayers of a covalent organic framework (COF) on an inert, catalytically inactive graphite surface. Boronic acid condensation (dehydration) is employed as the polymerization reaction.

Aug 19, 2019 · STMs have demonstrated a striking ability to induce individual molecules to undergo a variety of processes 7, such as changing conformation, dissociation and chemical reactions. These processes...

These results highlight the importance of using complementary spectroscopic techniques in conjunction with STM to analyse 2D-COFs. This approach provides new insights into both the chemistry of 2D-COF formation on surfaces and the role of …

在这篇文章中，来自比利时鲁汶大学Steven De Feyter（点击查看介绍）研究组的成员利用原位的扫描隧道显微镜 （scanning tunneling microscopy, STM），在室温条件下借助电场诱导表面聚合反应，首次从分子尺度上原位观测到了一种COF到另一种COF的相转变过程，并对转化机理进行了探讨。 基于课题组前期的研究（J. Am. Chem. Soc., 2019, 141, 11404）结果，作者发现在STM产生的局域强电场作用下，可在室温条件下实现对COFs表面聚合/解聚合反应的可逆调控，因 …

Covalent organic frameworks (COFs) are 2D molecular networks formed through covalent self-assembly of precursor molecules (two examples are shown in Fig. 1).1 COFs provide a new strategy for creating 2D materials by designing the unit cell as a molecule and then stitching the unit cells together into a crystal through molecular self-assembly.2 T...