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Low-Temperature Carbon Dioxide Gas Sensor Based on Yolk-Shell Ceria Nanospheres.

Cecilia A Zito1,2, Tarcísio M Perfecto1, Ann-Christin Dippel3

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This study presents a novel hollow nanostructured cerium oxide (CeO2) sensor for efficient carbon dioxide (CO2) detection at low temperatures. The developed sensor demonstrates superior sensitivity and stability for practical CO2 monitoring applications.

Keywords:
CO2 sensingPDF analysisceriachemoresistivehollow structure

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Carbon dioxide (CO2) monitoring is crucial across various applications.
  • Metal oxide chemoresistive sensors offer promise for CO2 detection.
  • Developing efficient low-temperature CO2 sensors remains a significant challenge.

Purpose of the Study:

  • To report a low-temperature hollow nanostructured CeO2-based sensor for CO2 detection.
  • To investigate the sensing performance of yolk-shell CeO2 nanospheres.
  • To demonstrate an effective strategy for enhancing metal oxide sensor properties at low operating temperatures.

Main Methods:

  • Fabrication of hollow nanostructured CeO2 (yolk-shell nanospheres).
  • Monitoring electrical resistance changes upon CO2 exposure at 100 °C and 70% relative humidity.
  • Comparison with commercial ceria nanoparticles.

Main Results:

  • The yolk-shell CeO2 sensor exhibited 2 times higher sensitivity compared to commercial nanoparticles.
  • Enhanced stability, reversibility, and faster response times were observed.
  • The hollow and porous structure facilitated improved gas diffusion and a high specific surface area, leading to greater CO2 adsorption capacity.

Conclusions:

  • Hollow nanostructured CeO2 (yolk-shell) sensors show high performance for CO2 detection at low temperatures (100 °C).
  • The unique nanostructure enhances gas diffusion and adsorption, improving sensing capabilities.
  • This approach offers a viable strategy for practical, low-temperature CO2 sensing.