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João Flavio da Silveira Petruci1,2, Andreas Wilk2, Arnaldo Alves Cardoso1

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Sensor Technology

Background:

  • Greenhouse gas emissions, including nitrous oxide (N₂O), require annual reporting under the Kyoto Protocol.
  • Diverse N₂O emission sources necessitate sensitive, compact, and easy-to-operate in-situ monitoring technologies.

Purpose of the Study:

  • To develop an innovative portable mid-infrared (MIR) chemical sensor system for quantifying gaseous N₂O.
  • To enable accurate and sensitive in-situ monitoring of N₂O emissions across various scenarios.

Main Methods:

  • Coupling a substrate-integrated hollow waveguide (iHWG) as a miniaturized MIR photon conduit and gas cell to a custom preconcentrator.
  • Utilizing a compact Fourier transform infrared (FTIR) spectrometer for spectroscopic detection after thermal desorption of N₂O from a solid sorbent.
  • Achieving molecularly selective detection of N₂O.

Main Results:

  • The developed sensor system achieved a limit of detection (LOD) of 5 ppbv for N₂O.
  • The system demonstrated flexibility in sampling time, flow rate, and iHWG design.

Conclusions:

  • The portable N₂O sensor system offers a versatile solution for diverse applications, including environmental monitoring and medical analysis.
  • The device facilitates tailored monitoring solutions for soil, aquatic, aerial (drone/UAV-mounted), and clinical settings.