Epitaxial Growth of γ-Cyclodextrin-Containing Metal–Organic Frameworks Based on a Host–Guest Strategy
| Autor: | Zhichang Liu, Gang Wang, Xirui Gong, Yi Shi, Chung Wei Kung, Peng Li, Qing-Hui Guo, Tobin J. Marks, Ji-Min Han, J. Fraser Stoddart, Dengke Shen, Youssry Y. Botros, Antonio Facchetti, Chuyang Cheng, Andrew C.-H. Sue, Kang Cai, Omar K. Farha, Hongliang Chen |
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| Rok vydání: | 2018 |
| Předmět: |
Chemistry
Conductance 02 engineering and technology General Chemistry Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Epitaxy Electrochemistry 01 natural sciences Biochemistry Catalysis 0104 chemical sciences Colloid and Surface Chemistry Chemical engineering Monolayer Molecule Metal-organic framework Crystallite 0210 nano-technology |
| Zdroj: | Journal of the American Chemical Society. 140:11402-11407 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | A class of metal-organic frameworks (MOFs)-namely CD-MOFs-obtained from natural products has been grown in an epitaxial fashion as films on the surfaces of glass substrates, which are modified with self-assembled monolayers (SAMs) of γ-cyclodextrin (γ-CD) molecules. The SAMs are created by host-guest complexation of γ-CD molecules with surface-functionalized pyrene units. The CD-MOF films have continuous polycrystalline morphology with a structurally out-of-plane ( c-axial) orientation, covering an area of several square millimeters, with a thickness of ∼2 μm. Furthermore, this versatile host-guest strategy has been applied successfully in the growth of CD-MOFs as the shell on the curved surface of microparticles as well as in the integration of CD-MOF films into electrochemical devices for sensing carbon dioxide. In striking contrast to the control devices prepared from CD-MOF crystalline powders, these CD-MOF film-based devices display an enhancement in proton conductance of up to 300-fold. In addition, the CD-MOF film-based device exhibits more rapid and highly reversible CO2-sensing cycles under ambient conditions, with a 50-fold decrease in conductivity upon exposure to CO2 for 3 s which is recovered within 10 s upon re-exposure to air. |
| Databáze: | OpenAIRE |
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