Low ppm NO₂ detection through advanced ultrasensitive copper oxide gas sensor

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Environmental gas sensors are crucial for monitoring hazardous gases like nitrogen dioxide (NO2).
• Metal oxide nanostructures offer superior performance for gas sensing applications.
• Effective detection of NO2 is vital due to its detrimental effects on health and the environment.

Purpose of the Study:

• To investigate the gas sensing properties of a copper oxide-based sensor for NO2 detection.
• To evaluate the sensor's performance at an optimal operating temperature of 100°C for 5 ppm NO2.
• To assess the sensor's sensitivity, detection limit, and selectivity.

Main Methods:

• Copper oxide material synthesized via a facile precipitation method.
• Material characterization using XRD, FE-SEM, UV-visible spectroscopy, photoluminescence spectroscopy, XPS, and BET techniques.
• Gas sensing performance evaluated for 5 ppm NO2 at 100°C.

Main Results:

• The copper oxide sensor achieved a response of 67.1% towards 5 ppm NO2 at 100°C.
• An impressive detection limit of 300 ppb was demonstrated.
• The sensor exhibited high selectivity for NO2 over other gases (NH3, CO, CO2, H2S).

Conclusions:

• Copper oxide nanostructures are effective materials for NO2 gas sensing.
• The developed sensor demonstrates high sensitivity, a low detection limit, and excellent selectivity for NO2.
• This research contributes to the development of advanced environmental monitoring technologies.