Rapid Response High Temperature Oxygen Sensor Based on Titanium Doped Gallium Oxide

Area of Science:

• Materials Science
• Chemical Sensing
• Energy Technology

Background:

• Real-time monitoring of combustion is vital for emission reduction and energy efficiency.
• Existing oxygen sensors struggle with response time and stability in extreme high-temperature environments.
• Gallium oxide (Ga₂O₃) shows promise but requires enhancement for practical applications.

Purpose of the Study:

• To develop novel materials for high-performance oxygen sensors capable of operating in extreme combustion environments.
• To improve the response time and stability of gallium oxide-based oxygen sensors at elevated temperatures.
• To investigate the effect of titanium (Ti) doping on the oxygen sensing properties of β-Ga₂O₃.

Main Methods:

• Fabrication of nanocrystalline β-Ga₂O₃ thin films.
• Doping β-Ga₂O₃ films with 5% titanium (Ti).
• Characterization of oxygen sensing performance, including response time, stability, and sensitivity at elevated temperatures.

Main Results:

• Ti-doped β-Ga₂O₃ films demonstrated a significant improvement in oxygen sensing response time (approximately 20 times faster).
• The doped sensors maintained excellent long-term stability and repeatability at high temperatures.
• Enhanced sensitivity to oxygen was observed in the Ti-doped Ga₂O₃ sensors.

Conclusions:

• Titanium doping is an effective strategy to enhance the performance of Ga₂O₃-based oxygen sensors.
• These advanced sensors offer rapid response and stability, crucial for integration into combustion systems.
• The developed sensors represent a key advancement for efficient energy conversion and emission reduction technologies.