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Selective gas detection using Mn3O4/WO3 composites as a sensing layer.

Yongjiao Sun1, Zhichao Yu1, Wenda Wang1

  • 1Micro and Nano System Research Center, College of Information and Computer, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.

Beilstein Journal of Nanotechnology
|August 22, 2019
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Summary

This study developed improved gas sensors using manganese oxide/tungsten oxide (Mn3O4/WO3) composites. The composite sensors showed enhanced detection of specific gases like hydrogen sulfide (H2S) and ammonia (NH3) at optimal temperatures.

Keywords:
Mn3O4/WO3 compositesgas sensingheterojunctionsselectivityworking temperature

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Metal oxide semiconductors are crucial for gas sensing applications.
  • Tungsten oxide (WO3) is a promising material, but its performance can be limited.
  • Composite materials offer opportunities to enhance sensing capabilities.

Purpose of the Study:

  • To synthesize and characterize Mn3O4/WO3 composite materials for gas sensing.
  • To investigate the gas sensing performance of pure WO3 and Mn3O4/WO3 composites.
  • To evaluate the effect of Mn concentration on sensor performance and selectivity.

Main Methods:

  • Facile hydrothermal method for synthesizing pure WO3 and Mn3O4/WO3 composites.
  • Systematic investigation of gas sensing properties at various temperatures.
  • Analysis of sensor response to different gases, including hydrogen sulfide (H2S), ammonia (NH3), and carbon monoxide (CO).

Main Results:

  • Mn3O4/WO3 composite sensors exhibited significantly improved gas sensing performance compared to pure WO3.
  • The optimal Mn concentration for enhanced performance was found to be 3 atom %.
  • The sensor with 3 atom % Mn demonstrated high selectivity towards H2S at 90 °C, NH3 at 150 °C, and CO at 210 °C.

Conclusions:

  • The heterojunction formed between Mn3O4 and WO3 is responsible for the enhanced sensing properties.
  • The Mn3O4/WO3 composite (3 atom % Mn) shows great potential for selective gas recognition and detection.
  • This development opens avenues for advanced gas sensing applications.