Journal
NANO RESEARCH
Volume -, Issue -, Pages -Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-023-5704-0
Keywords
substrate orientation effect; covalent organic frameworks (COFs); on-surface synthesis; high-resolution atomic force microscopy (HR-AFM)
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In this study, highly ordered monolayer COFs were successfully constructed on the surfaces of HOPG, hBN, and MoS2. HR-AFM imaging clearly reveals the substrate orientation effect in COFs/2D materials heterostructure. This work provides direct evidence for substrate effects in the on-surface synthesis of COFs and paves the way for further investigation into the intrinsic electronic properties of monolayer COFs and the development of multifunctional hybrid devices.
Heterostructures based on covalent organic frameworks (COFs) and other two-dimensional (2D) materials attract considerable attention due to their extraordinary properties and tremendous application potential. Substrate effects play a crucial role in the integration of ultrathin COF films onto 2D materials through direct polymerization. In this study, highly ordered monolayer COFs were successfully constructed on the surfaces of highly oriented pyrolytic graphite (HOPG), hexagonal boron nitride (hBN), and molybdenum disulfide (MoS2). High-resolution atomic force microscopy (HR-AFM) imaging clearly reveals the substrate orientation effect in COFs/2D materials heterostructure. Honeycomb networks formed via Schiff-base reaction and boronic acid condensation reaction can epitaxially grow in specific orientations relative to the underlying substrate lattices. This work provides direct evidence for substrate effects in the on-surface synthesis of COFs and paves the way for further investigation into the intrinsic electronic properties of monolayer COFs and the development of multifunctional hybrid devices.
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