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

Sandeep Manandhar1, Anil K Battu1, Arun Devaraj2

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Developing advanced oxygen sensors is crucial for emission reduction. Ti-doped gallium oxide (Ga2O3) sensors show a ~20x faster response and improved stability for extreme environments.

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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.