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Updated: Mar 24, 2026

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
Published on: March 21, 2014
A Photoresponsive Surface Covalent Organic Framework: Surface-Confined Synthesis, Isomerization, and Controlled Guest
Chunhua Liu1, Wei Zhang2, Qingdao Zeng3
1State Key Laboratory of Robotics and System (HIT), Harbin Institute of Technology, Harbin, 150080, P. R. of China.
Abstract:
By introducing an azobenzene group to the backbone of diboronic acid, we have obtained a surface-confined, photoresponsive single-layer covalent organic framework with long-range order and almost entire surface coverage. Scanning tunneling microscopic characterization indicates that though the covalent linkage provides a significant locking effect, isomerization can still happen under UV irradiation, which causes destruction of the surface COF. Furthermore, the decomposed surface COF can recover upon annealing. This photoinduced decomposition provides a facile approach for the controlled capture and release of targeted objects using these nanoporous surface COFs as a host, which has been demonstrated in this work using copper phthalocyanine as a model guest.
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