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Ionic Covalent Organic Framework as a Dual Functional Sensor for Temperature and Humidity.

Gobinda Das1, Fayrouz Abou Ibrahim1, Zahraa Abou Khalil2

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Summary

Researchers developed a new covalent organic framework (COF) sensor that visually detects humidity and temperature changes. This novel material exhibits reversible fluorescence, overcoming limitations of traditional hydrophobic sensors for improved environmental monitoring.

Keywords:
humidity sensorionic covalent organic frameworkstimuli‐responsive materialstemperature sensor

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Solid-state visual sensing of humidity and temperature is crucial for daily life and industry.
  • Hydrophobic covalent organic frameworks (COFs) typically show poor optical responses to moisture, limiting their sensing capabilities.

Purpose of the Study:

  • To enhance the optical response of COF sensors to moisture by incorporating H-bonding ionic functionalities.
  • To develop a highly sensitive COF capable of detecting changes in temperature and moisture content.

Main Methods:

  • Fabrication of a novel COF, termed TG-DFP, using guanidinium and diformylpyridine linkers.
  • Incorporation of hydrophilic functionalities to promote water uptake and hydrogen bonding within the COF network.
  • Investigation of the optical properties and response to relative humidity and temperature.

Main Results:

  • The TG-DFP COF demonstrated enhanced water uptake due to its hydrophilic nature.
  • Trapped water molecules formed numerous hydrogen bonds, restricting internal bond rotation.
  • Despite non-emissive building blocks, the COF exhibited reversible fluorescence and solid-state optical hydrochromism.
  • The sensor showed high sensitivity to changes in relative humidity and temperature.

Conclusions:

  • Incorporating H-bonding ionic functionalities into COFs significantly improves their optical response to moisture.
  • The TG-DFP COF presents a promising platform for visual sensing of humidity and temperature.
  • This work overcomes limitations of hydrophobic COF sensors, enabling new applications in environmental monitoring.