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#38651538 2024/04/23 To Up

A wafer scale thin film of ultra-small ScO nanocrystals on a 2D COF with high rigidity.

Scandium oxide (ScO) has a wide range of applications in metallurgy, chemical industry, electronics and many other high-tech fields. However, most ScO materials exist in the powder or bulk form, while nanostructured ScO has rarely been reported as there is a lack of a common method to control its dimensionality, hindering the understanding of new properties and potential applications of nano-ScO materials. In this paper, we establish a procedure to synthesize a two-dimensional (2D) ScO-covalent organic framework (COF) composite film where the crystal size of ScO domains is as small as ∼3 nm. The composite film is prepared by a Schiff base condensation reaction at the sharp -pentane/water interface using a combination of surfactant-monolayer-assisted interfacial synthesis and laminar assembly polymerization methods. Then the conditions of nucleation and uniform film formation of the 2D ScO/COF are explored further. Meanwhile, an atomic force microscopy indentation test shows that the material has a high Young's modulus of 89.1 ± 3.8 GPa, which is much higher than those of the majority of reported 2D polymer materials. We further extended this synthesis method to the preparation of YbO (ytterbium oxide) and/or ErO (erbium oxide)-incorporated 2D COF composite films, verifying the universality of this strategy. This work provides an opportunity to vary the dimensionality of many kinds of metal oxides and explore the potential applications of low-dimensional ScO materials.
Xin Guan, Xiaohui Xu, Zhongliang Yu, Junjie Xiong, Yanhong Chang, Bowen Liu, Bin Wang