COF film, preparation method, transfer method and application thereof, and chip containing same

Abstract

The invention provides a COF film, a preparation method, a transfer method and application thereof, and a chip containing the same. According to the preparation method, the COF film is prepared through polymerization reaction between hexaamino triptycene and pyrene tetraketone; the pi-pi accumulation effect between two-dimensional COF film layers is weakened; the porous COF film with single-layerthickness and extremely high pore density is obtained; and holes do not need to be formed in a plasma bombardment mode like a traditional single-layer graphene film. The COF film has remarkable separation and detection capacity for ions with different hydrated ion radiuses and also has higher ion permeability, and due to the characteristics, the COF film can be used for preparing an ion detectionchip so as to realize ultrafast ion separation and detection.

Description

technical field [0001] The invention relates to the field of membrane materials, in particular to a COF membrane, its preparation method, transfer method, application and a chip containing the same. Background technique [0002] Membrane is a barrier that allows selective transport and delivery of substances, and is the basis for a series of separation processes driven by pressure, potential, concentration or temperature gradients. Based on the modularity, scalability, compactness and high With advantages such as energy efficiency, the use of membrane materials for material separation in the fields of energy, water, food, biotechnology and chemical processing has become a common technical means. The main uses of membrane materials include seawater desalination, natural gas purification, production of nitrogen in the air, hemodialysis, bioprocessing, solvent and petrochemical separation, and production of ultrapure water. In addition to being used as separation materials, mem...

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Problems solved by technology

However, the above-mentioned graphene-like film material itself is a dense thin film structure, and it needs to make holes on its surface by plasma bombardment and other methods to make it permeable and have the function of selective transmission. However, the bombardment time Too long will easily produce large pores on the surface, which will affect the selectivity of the film. Therefore, it is difficult to obtain a high pore density on the surface of graphene-like film materials by plasma bombardment and other methods, and it is difficult to realize industrial applications.

[0004] The two-dimensional covalent organic framework (COF) material film also has a graphene-like interlayer stacking structure, and it has micropores. It is an ideal choice for ultra-high-throughput molecular separation materials. However, due to the It is easy to produce π-π stacking between them, and it is difficult to prepare a single-layer COF film with a large area and no defects in the prior art. For example, CN103209763A discloses a COF film in contact with a polyaromatic carbon layer. It is obtained by depositing different types of COF materials on the olefin layer, and the obtained COF film has a thickness of 5 nm to 1 μm, which can be used to prepare solar cells, flexible displays, lighting equipment, gas separation and storage devices, etc., and the obtained structure thickness is still Larger and requires the participation of graphene layers, still needs further improvement

[0005] So far, due to the influence of the π-π stacking effect between COF layers, a single-layer COF separation membrane structure with high ion permeability and selectivity has not been obtained in the prior art. Continue to research and develop on the basis of existing technology, by selecting new components to synthesize a new COF film layer, weakening the π-π stacking effect between the two-dimensional COF film layers, and obtaining a very thin single-layer thickness, itself a porous structure, with extremely COF membranes with high pore density and do not need to be pore-formed by plasma bombardment like graphene membranes and other materials, so that they have high ion permeability and can be used for ultra-fast ion separation and detection

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