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High Sensitivity Bi2O3/Ti3C2Tx Ammonia Sensor Based on Improved Synthetic MXene Method at Room Temperature.

Baocang Zhou1, Zhihua Zhao1, Zhenli Lv1

  • 1College of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou 450052, China.

Sensors (Basel, Switzerland)
|October 26, 2024
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Summary

A novel bismuth oxide/titanium carbide composite (Bi2O3/Ti3C2Tx) enhances ammonia gas sensing. This material offers superior sensitivity, repeatability, and rapid response times for accurate room-temperature detection.

Keywords:
Bi2O3MXeneTi3C2Txammonia sensorgas sensors

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • MXene Ti3C2Tx is a promising material for gas sensing applications.
  • Ammonia (NH3) detection is crucial in environmental monitoring and industrial safety.
  • Developing highly sensitive and selective gas sensors remains a significant challenge.

Purpose of the Study:

  • To synthesize a novel Bi2O3/Ti3C2Tx composite material.
  • To evaluate the gas sensing performance of the composite for ammonia detection.
  • To investigate the gas sensing mechanism of the Bi2O3/Ti3C2Tx-based sensor.

Main Methods:

  • Synthesized MXene Ti3C2Tx using hydrofluoric acid and an improved multilayer method.
  • Prepared Bi2O3/Ti3C2Tx composite via hydrothermal synthesis.
  • Fabricated and tested a gas sensor based on the composite material at room temperature.

Main Results:

  • The Bi2O3/Ti3C2Tx composite exhibits a unique layered structure with a large surface area.
  • The sensor demonstrated high responsiveness (61% for 100 ppm NH3), good repeatability, and rapid response/recovery times (61 s/164 s).
  • The composite sensor's performance significantly outperformed individual Ti3C2Tx and Bi2O3 sensors.

Conclusions:

  • The Bi2O3/Ti3C2Tx composite material shows excellent potential for ammonia gas sensing.
  • The developed sensor offers enhanced accuracy and precision for room-temperature ammonia detection.
  • The study proposes a gas sensing mechanism, highlighting potential applications in various scenarios.