Near-Room-Temperature Ethanol Detection Using Ag-Loaded Mesoporous Carbon Nitrides

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Development of room-temperature gas sensors is critical for detecting volatile organic compounds (VOCs).
• Existing sensors often require high temperatures, limiting practical applications.
• Two-dimensional materials with high surface areas are sought for enhanced gas sensing performance.

Purpose of the Study:

• To fabricate a fast-response, low-parts-per-million (ppm) ethanol gas sensor operating near room temperature.
• To utilize cubic mesoporous graphitic carbon nitride (g-CN) synthesized via template inversion.
• To investigate the sensing properties of Ag/g-CN for volatile organic compound (VOC) detection.

Main Methods:

• Synthesis of cubic mesoporous graphitic carbon nitride (g-CN) using KIT-6 silica as a template.
• Fabrication of an optimized Ag/g-CN gas sensor.
• Testing the sensor's response, selectivity, and recovery to ethanol gas at different temperatures (40 °C and 250 °C).

Main Results:

• The optimized Ag/g-CN sensor demonstrated a high response (Ra/Rg = 49.2) and fast response (11.5 s) to 50 ppm ethanol at 250 °C.
• At near room temperature (40 °C), the sensor showed selective, reversible, and rapid response/recovery to 50 ppm and 100 ppm ethanol.
• The sensor exhibited long-term stability, attributed to its 3D mesoporous structure and high surface area.

Conclusions:

• The developed Ag/g-CN sensor is effective for near room-temperature ethanol detection.
• The material's unique structure facilitates high surface area and efficient gas molecule interaction.
• This research opens new pathways for designing next-generation room-temperature VOC sensors for indoor air quality monitoring.