期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 25, 页码 8698-8704出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b04096
关键词
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资金
- MOE under AcRF [ARC 19/15, MOE2014-T2-2-093, MOE2015-T2-2-057, MOE2016-T2-2-103, 2016-T1-001-147, 2016-T1-002-051]
- NTU [M4081296.070.500000]
- iFood Research Grant [M4081458.070.500000]
- Singapore Millennium Foundation in Singapore
The ability to prepare ultrathin two-dimensional (2D) covalent organic framework (COF) nanosheets (NSs) in high yield is of great importance for the further exploration of their unique properties and potential applications. Herein, by elaborately designing and choosing two flexible molecules with C-3, molecular symmetry as building units, a novel imine-linked COF, namely, TPA-COF, with a hexagonal layered structure and sheet-like morphology, is synthesized. Since the flexible building units are integrated into the COF skeletons, the interlayer stacking becomes Weak, resulting in the easy exfoliation of TPA-COF into ultrathin 2D NSs. Impressively, for the first time, the detailed structural information, i.e., the pore channels and individual building units in the NSs, is clearly visualized by using the recently developed low-dose imaging technique of transmission electron microscopy (TEM). As a proof-of-concept application, the obtained ultrathin COF NSs ate used as a novel fluorescence sensing platform for the highly sensitive and selective detection of DNA.
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