化学
金属有机骨架
环糊精
外延
微晶
单层
分子
纳米技术
芘
化学工程
金属
结晶学
图层(电子)
有机化学
吸附
材料科学
工程类
生物化学
作者
Dengke Shen,Gang Wang,Zhichang Liu,Peng Li,Kang Cai,Chuyang Cheng,Yi Shi,Ji Min Han,Chung Wei Kung,Xirui Gong,Qing‐Hui Guo,Hongliang Chen,Andrew C.‐H. Sue,Youssry Y. Botros,Antonio Facchetti,Omar K. Farha,Tobin J. Marks,J. Fraser Stoddart
摘要
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.
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