Metal Oxide Thin Films Prepared by Magnetron Sputtering Technology for Volatile Organic Compound Detection in the...

Area of Science:

• Materials Science
• Chemical Sensing
• Microwave Engineering

Background:

• Metal oxide thin films are crucial for gas sensing applications.
• Microwave-based sensors offer unique detection capabilities.
• Volatile organic compounds (VOCs) are important industrial and biomedical targets.

Purpose of the Study:

• To develop and evaluate metal oxide thin films as gas-sensitive layers in microwave gas sensors.
• To investigate the sensor performance for detecting acetone, ethanol, and methanol.
• To assess the sensor's viability at room temperature and standard humidity.

Main Methods:

• Thin films of copper oxide (CuO), tin dioxide (SnO₂), and titanium dioxide (TiO₂) were deposited using magnetron sputtering.
• Microwave-based gas sensors operating at 2.4 GHz were fabricated with these films.
• Sensors were tested at 23 °C and 50% relative humidity (RH) with VOC concentrations ranging from 0–200 ppm.

Main Results:

• CuO-based sensors demonstrated the highest response to acetone.
• SnO₂-based sensors exhibited the best sensitivity to ethanol.
• Both SnO₂ and TiO₂ sensors showed good sensitivity for methanol detection.

Conclusions:

• Magnetron-sputtered metal oxide thin films are effective gas-sensitive materials for microwave sensors.
• The developed sensors show promise for detecting specific VOCs like acetone, ethanol, and methanol.
• The sensor technology is suitable for room-temperature operation, enhancing its practical applicability.