Post-Synthetic Modification of ZIF-8 Crystals and Films through UV Light Photoirradiation: Impact on the Physicochemical Behavior of the MOF |
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Authors: | Dr. Rocío L. Papurello Luis A. Lozano Dr. Enrique V. Ramos-Fernández José L. Fernández Dr. Juan M. Zamaro |
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Affiliation: | 1. Instituto de Investigaciones en Catálisis y Petroquímica, INCAPE (FIQ, UNL, CONICET), Santiago del Estero, 2829 (3000) Santa Fe, Argentina;2. Instituto Universitario de Materiales de Alicante, Dto. de Química Inorgánica, Universidad de Alicante, Apartado 99, Alicante, España;3. Instituto de Química Aplicada del Litoral, IQAL (UNL, CONICET) and Programa de Electroquímica Aplicada e Ingeniería Electroquímica, PRELINE (FIQ, UNL), Universidad Nacional del Litoral, Santiago del Estero, 2829 (3000) Santa Fe, Argentina |
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Abstract: | The physicochemical modification of Metal-Organic Frameworks (MOFs) is a current challenge in the search to improve their performance in different technological applications. In this work we analyze the post-synthetic modification of ZIF-8 crystals and films through a simple and clean treatment that involves the exposure to a UV lamp under environmental conditions. It is demonstrated that a short treatment alters the MOF structure and chemistry, providing a modified ZIF-8 due to partial disconnections of its structure which increase the amount of terminal surface species such as Zn−OH and −C=N-H, but without compromising the overall MOF structure, specific surface area or thermal stability. Additionally, it leads to changes in several properties of the ZIF-8, such as its capacity to accumulate charge through pseudocapacitive processes, its interaction with nitric oxide and its light absorption behavior. This strategy of modifying ZIF-8 without the use of chemicals through a gentle disconnection of its own structure could open new perspectives of post-functionalization of crystals and films of ZIF-8 to be used in a wide range of applications. |
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Keywords: | post-synthetic modifications surface properties ultraviolet light zeolitic imidazolate frameworks ZIF-8 |
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