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Polymerization Time-Optimized Covalent Organic Framework for Ultrasensitive Ethylene Glycol Sensing.

Junxi Cheng1,2, Chang Liu1,2, Miaomiao Liu3

  • 1School of Materials Science and Engineering, Xinjiang University, Urumqi, Xinjiang 830046, China.

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|February 27, 2026
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Summary
This summary is machine-generated.

Researchers developed a room-temperature covalent organic framework (COF-TPC) sensor for detecting toxic ethylene glycol (C2H6O2). The COF-T-50 sensor shows high response, selectivity, and stability, offering an energy-efficient detection alternative.

Keywords:
COFsDFT calculationsethylene glycolgas-sensitive sensorsroom temperature

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Ethylene glycol (C2H6O2) is a common but toxic chemical necessitating efficient, low-temperature detection methods.
  • Existing high-temperature sensors are energy-intensive and less suitable for certain applications.
  • Covalent organic frameworks (COFs) offer tunable properties for advanced sensing applications.

Purpose of the Study:

  • To synthesize and characterize an imine COF (COF-TPC) for ethylene glycol detection at room temperature.
  • To investigate the structure-property relationship of COF-TPC sensors by varying synthesis time.
  • To evaluate the sensor's performance, selectivity, stability, and moisture resistance for ethylene glycol detection.

Main Methods:

  • Room-temperature synthesis of COF-TPC using specific ligands (Tp and Pa-Cl) and acetic acid catalyst.
  • Fabrication of four distinct sensors (COF-T-30, COF-T-40, COF-T-50, COF-T-60) by controlling Schiff base reaction time.
  • Gas sensing performance evaluation, including response, selectivity across 13 gases, repeatability, and moisture resistance tests.
  • Density Functional Theory (DFT) calculations to elucidate adsorption mechanisms and selectivity origins.

Main Results:

  • The COF-T-50 sensor demonstrated a high response (6107%) to 500 ppm ethylene glycol.
  • COF-T-50 exhibited superior performance compared to other synthesized sensors.
  • Exceptional selectivity towards ethylene glycol among 13 tested gases was observed, alongside excellent repeatability and moisture resistance.

Conclusions:

  • Room-temperature synthesized COF-TPC, particularly COF-T-50, provides a highly effective platform for ethylene glycol detection.
  • The developed sensor offers an energy-efficient, stable, and selective alternative to traditional methods.
  • This research expands the application scope of COFs in rapid and reliable gas sensing.