Self-supporting two-dimensional film as well as preparation method and application thereof

Abstract

The invention provides a self-supporting two-dimensional film as well as a preparation method and application thereof. The self-supporting two-dimensional film comprises a film-forming material which is stacked to form the film, wherein the film-forming material is sheet-shaped, a layered channel is formed based on nanosheet stacking, and a good filtering function can be achieved. The thickness of the self-supporting two-dimensional film disclosed by the invention can be determined by the amount of the filtered film-forming materials, and the more the filtered and accumulated film-forming materials are, the thicker the obtained film is, so the control on the film thickness can be realized by controlling the amount of the filtered film-forming materials.

Description

technical field [0001] The invention belongs to the technical field of membrane materials, and in particular relates to a self-supporting two-dimensional membrane and its preparation method and application. Background technique [0002] Graphene oxide (Graphene Oxide, referred to as GO), transition metal titanium carbide (a family of transition metal carbides and carbonitrides) is synthesized by selectively etching the atoms of the MAX phase using hydrofluoric acid at room temperature, called MXenes) and Covalent Organic Frameworks (COFs) are three common two-dimensional membrane construction materials. These two-dimensional materials form a two-dimensional film with layered channels through external effects such as vacuum filtration, interface assembly, and interface polymerization. The layered channels in the film have the functions of selectively transporting, intercepting, and storing molecular ions. Dimensional membranes have broad application prospects in the fields o...

AI Technical Summary

Problems solved by technology

However, although these methods can prepare two-dimensional membranes of a certain size and thickness, the transfer process is carried out in the solution phase, and the operation procedures are complicated, which is easy to cause secondary damage to the self-supporting membrane.

Moreover, during the scale-up preparation process, the requirements for the size and strength of the container are greatly increased, and the amount of toxic and harmful solvents used is large, which is not conducive to environmental protection

In addition, although high-purity 2D films can be prepared by gas-phase lamination, the transfer of 2D films prepared by this process is difficult, and the substrate cannot be reused, which increases the manufacturing cost.

In particular, none of these two-dimensional film preparation processes can simultaneously prepare self-supporting two-dimensional films by doping to control the size of layered channels.

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