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Room-Temperature Carbon Dioxide Gas Sensor Based on Co-Ferrite Nanoparticles.

Yogesh Mahor1, Dorota Koziej1,2, Cecilia A Zito1,2

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Cobalt ferrite nanoparticles show promise for carbon dioxide (CO2) sensing at room temperature. Their performance is influenced by humidity and particle size, crucial factors for developing effective CO2 sensors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Environmental Science

Background:

  • Accurate carbon dioxide (CO2) monitoring is vital for environmental and indoor air quality.
  • Developing sensitive and reliable CO2 sensors is an ongoing research challenge.

Purpose of the Study:

  • To evaluate the CO2-sensing capabilities of cobalt ferrite (CoFe2O4) nanoparticles (NPs) at room temperature.
  • To investigate the impact of relative humidity (RH) and particle size on sensor performance.

Main Methods:

  • Synthesis of phase-pure CoFe2O4 NPs with an average size of 6 nm.
  • Fabrication and testing of gas sensors using these NPs.
  • Analysis of sensor response to varying CO2 concentrations and RH levels.

Main Results:

  • The 6 nm CoFe2O4 NPs exhibited high CO2 sensitivity and a nearly linear response from 250 to 4000 ppm at 30% RH.
  • Sensor performance showed stable reproducibility and reliable response/recovery.
  • Higher humidity (50% RH) altered the sensing mechanism, while larger crystallite sizes (60 nm) reduced CO2 signal.

Conclusions:

  • CoFe2O4 NPs are a promising material for room-temperature CO2 detection.
  • Particle size and humidity significantly influence the CO2 sensing performance of CoFe2O4 NPs.
  • Optimized CoFe2O4 NP-based sensors offer potential for real-life CO2 monitoring applications.