SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 4: Mini-Symposium: Free-standing functional molecular 2D materials I

O 4.4: Hauptvortrag

Montag, 1. März 2021, 11:30–12:00, R2

Macroscopic Two-Dimensional Polymers: Synthesis and Structure Control — •Zhikun Zheng — Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China

At present, one of the key challenges faced by the scientific community is to go beyond graphene, a prototypical two-dimensional polymer (2DP, a laterally infinite, one atom- or monomer-unit thin, free-standing network with long-range order along two orthogonal directions), to synthesize its analogues with structural control at the atomic- or molecular- level under mild conditions. Here we present the rational synthesis of monolayer and multilayer 2DPs at an air-water interface. Such 2DPs are highly crystalline with controlled aggregate structure and microstructure and tunable single-crystal domain size in the range of tens of nanometers to several micrometers. They have a tunable thickness ranges from 0.7 nm to around 1μm and a lateral size up to 4-inch wafer, and can be freely suspended over 40 μm * 40 μm sized holes. They are rigid and flexible, and can be conformed and bonded robustly to nearly any surface, facilitating their integration with target supports or into devices for the extraction of properties. On the basis of the elucidation of their molecular structures, near atomic structures, grain boundaries and edge structures, some preliminary structure-property relationships of the 2DPs were obtained.