期刊
ACS NANO
卷 9, 期 12, 页码 11608-11617出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b06081
关键词
stimuli-responsive systems; controlled guest release; self-assembly; scanning tunneling microscopy; liquid-solid interface
类别
资金
- Fund of Scientific Research Flanders (FWO)
- KU Leuven [GOA 11/003]
- Belgian Federal Science Policy Office [IAP-7/05]
- European Research Council under the European Union's Seventh Framework Programme (FP7)/ERC [340324]
Dynamically switchable supramolecular systems offer exciting possibilities in building smart surfaces, the structure and thus the function of which can be controlled by using external stimuli. Here we demonstrate an elegant approach where the guest binding ability of a supramolecular surface can be controlled by inducing structural transitions in it. A physisorbed self-assembled network of a simple hydrogen bonding building block is used as a switching platform. We illustrate that the reversible transition between porous and nonporous networks can be accomplished using an electric field or applying a thermal stimulus. These transitions are used to achieve controlled guest release or capture at the solution solid interface. The electric field and the temperature-mediated methods of guest release are operative at different length scales. While the former triggers the transition and thus guest release at the nanometer scale, the latter is effective over a much larger scale. The flexibility associated with physisorbed self-assembled networks renders this approach an attractive alternative to conventional switchable systems.
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