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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Photostimulus-Responsive Large-Area Two-Dimensional Covalent Organic Framework Films.

Fei Yu1,2, Wenbo Liu1, Bang Li2

  • 1School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.

Angewandte Chemie (International Ed. in English)
|September 5, 2019
PubMed
Summary

This study demonstrates a novel 2D covalent organic framework (COF) that reversibly switches electrical conductivity using light. This photo-responsive material shows potential for advanced electronic applications.

Keywords:
covalent organic frameworkselectrical switchingexternal stimuliphotostimulus

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Modulating the electronic structure of materials with external stimuli is crucial for developing advanced functionalities.
  • Covalent Organic Frameworks (COFs) are a class of porous materials with tunable electronic properties.

Purpose of the Study:

  • To investigate the photo-responsive electronic behavior of a novel two-dimensional (2D) COF.
  • To demonstrate the reversible switching of electrical conductivity in COFs upon light irradiation.

Main Methods:

  • Synthesis of a 2D COF using a photo-responsive unit (1,2-bis(5-formyl-2-methylthien-3-yl)cyclopentene).
  • Irradiation with UV and visible light to induce reversible ring-closing/opening reactions.
  • Monitoring conductivity changes using a circuit with a light-emitting diode (LED).
  • Analysis of photoinduced kinetics and absorption spectra.

Main Results:

  • The 2D COF exhibited reversible switching of electrical conductivity between low and high states over 200 cycles upon UV and visible light exposure.
  • Photoinduced ring-closing/opening reactions did not compromise the structural integrity of the COF.
  • Both forward and reverse processes followed logarithmic carrier generation over time.
  • A clear correlation was established between the COF's electronic properties and changes in photoinduced kinetics and absorption spectra.

Conclusions:

  • The developed photo-responsive COF demonstrates a robust and reversible light-controlled conductivity switch.
  • This material holds promise for applications in optoelectronics and smart electronic devices.
  • The study highlights the potential of COFs in creating functional materials through external stimuli modulation.