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IT Home reported on August 11 that a research team from Zhejiang University has developed a new wrinkled MOF (metal-organic framework) film, opening up a new route for the integrated application of such materials in separation membranes, flexible electronics and other fields. The relevant research results were published in Science.

MOF is an emerging type of porous crystalline material with broad application prospects in the fields of gas storage, separation, catalysis, sensing, biomedicine, etc. However, MOF powders are difficult to dissolve and melt, and films are hard and brittle, making the molding and processing of such materials extremely difficult, which has always been a bottleneck hindering the integrated application of such materials.

The research team has overcome the above difficulties—— Making MOF films into a "wrinkled" structure greatly increases their active surface while also giving them excellent deformation capabilities.

▲Preparation of wrinkled MOF films with Turing patterns Confined interface synthesis method

The research team adopted a method based on the "Turing mechanism". By changing the concentration of the reaction reagents and the thickness of the polymer covering layer, the research team prepared 13 Turing patterns in five categories and obtained a metal-organic framework compound film with an adjustable morphology and a wrinkled structure.

▲Turing patterns of various shapes are obtained in wrinkled MOF films through "reaction-diffusion" regulation

According to experimental tests, the strain that ordinary metal organic framework compound films can withstand usually does not exceed 0.3%.Able to withstand strains up to 53.2% without breakingAnd it can be transferred between various substrates such as plexiglass, porous ceramics, metal electrodes, etc. like a sticker.

▲The wrinkled MOF film can be flexibly transferred to various substrates to achieve "plug and play"

Through this flexible transfer processing method, the research team prepared a gas separation membrane based on MOF materials.Highly efficient separation of hydrogen and carbon dioxide is achieved.In addition, they transferred the wrinkled MOF film onto a flexible electrode.Create a flexible humidity sensor.

The research team said: "This study proposes a new structural form for MOF thin film materials, realizes the decoupling of the film manufacturing process and functional integration, and gives this type of material a more imaginative application method. We hope that our research can helpLow Carbon Chemical Industry、Wearable devices、Healthcareareas of development.”

IT Home attached paper link: https://www.science.org/doi/10.1126/science.adn8168