Triazine-Based Two-Dimensional Organic Polymer for Selective NO₂ Sensing with Excellent Performance

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Practical gas sensors require high sensitivity, rapid response, selectivity, and room-temperature operation.
• Conventional metal oxide semiconductors and inorganic 2D polymers often fail to meet these demanding requirements.

Purpose of the Study:

• To demonstrate an organic 2D polymer derived from a covalent triazine framework (CTF) for superior gas sensing.
• To evaluate the gas sensing performance of the triazine-based 2D polymer (T-2DP) for nitrogen dioxide (NO2) detection.

Main Methods:

• Synthesis of a nanoscale, porous organic 2D polymer (T-2DP) from a CTF.
• Experimental evaluation of T-2DP's gas sensing properties, including sensitivity, response/recovery times, and selectivity.
• Fabrication of a flexible NO2 chemiresistor for wearable electronics application.

Main Results:

• T-2DP exhibited selective NO2 recognition with ultrahigh sensitivity (452.6 ppm⁻¹), surpassing other 2D nanomaterials and its CTF matrix.
• Achieved superfast (35-47 s) and fully reversible sensing at room temperature.
• Demonstrated potential for integration into wearable electronics via a flexible NO2 chemiresistor.

Conclusions:

• Organic 2D polymers offer a promising new avenue for designing high-performance gas sensing materials.
• T-2DP presents a viable candidate for next-generation wearable electronic devices requiring sensitive and rapid gas detection.