Manipulation of Amorphous‐to‐Crystalline Transformation: Towards the Construction of Covalent Organic Framework Hybrid Microspheres with NIR Photothermal Conversion Ability |
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| Authors: | Jing Tan Dr. Supawadee Namuangruk Weifu Kong Prof. Dr. Nawee Kungwan Prof. Dr. Jia Guo Prof. Dr. Changchun Wang |
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| Affiliation: | 1. State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Lab of Advanced Materials, Fudan University, Shanghai, China;2. National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency, Pathumthani, Thailand;3. Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand |
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| Abstract: | An approach to transforming amorphous organic networks into crystalline covalent organic frameworks (COFs) with retention of the colloidal nanosize and uniform morphology is presented. Specifically, Fe3O4 nanoclusters are encapsulated by a disordering polyimine network via the Schiff‐base reaction. The formed imine bonds could be reconstructed under thermodynamic control to reform the polyimine networks into imine‐linked COFs in situ. Such a core–shell microsphere exhibits the uniform size and spherical shape, controllable COF shell thickness, accessible surface modification, and improved solution dispersibility as well as maintenance of high surface area, periodic micropores, and superior magnetic responsiveness. Additionally, the photothermal conversion effect is demonstrated for the first time on the nanoCOF layers upon exposure to near infrared light, providing convincing evidence for potential use in phototherapy. |
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| Keywords: | composite microspheres covalent organic frameworks imines nanoclusters photothermal conversion |
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